Cheap but great steam games?

That is a great game, yes, but you know that already after 0,3h?:-D

Hard to recommend anything without knowing some genre preferences, but looks like you for fps/platformer? I can't help with those + no big sale right now, most of the games currently on full price.

If you dont care about imaginary, "permanent ownership of digital library", then EA Play is the best option to buy right now at least for one month, if you never purchased that before, for 0,79€ + if you can dedicate one month to play the EA titles you want to play.

Not cheap, completely free, but must see, IMO:
(First Person) Puzzle:
https://store.steampowered.com/app/1389630/High_Entropy_Challenges/
https://store.steampowered.com/app/1455920/EQI/
Something like previous:
https://store.steampowered.com/app/1416130/Perfect_Vermin/
(First Person) Adventure (18+):
https://store.steampowered.com/app/1401680/Lust_from_Beyond_Scarlet/
Arcade Flight:
https://store.steampowered.com/app/1214360/SKYE/
Visual novel (USSR-themed):
https://store.steampowered.com/app/331470/Everlasting_Summer/

https://store.steampowered.com/app/1531720/Need_for_Drive__Open_World_Multiplayer_Racing
https://store.steampowered.com/app/1279410/GUNBIRD_2/
https://store.steampowered.com/app/1379550/Pendrive_znaleziony_w_trawie
https://store.steampowered.com/app/1516090/Woodle_Deluxe/
https://store.steampowered.com/app/1292880/Hit_Zero_Chronos/
Will Send More Soon

Terraria, Starbound, Stardew Valley, and Undertale. But I see you already have all them so there's nothing left for me to recommend xD

https://store.steampowered.com/app/952040/MUSYNX/
https://store.steampowered.com/app/530390/Slayaway_Camp/
https://store.steampowered.com/app/1163740/Card_Hog/
https://store.steampowered.com/app/1414140/_Blade_of_God/
https://store.steampowered.com/app/1427680/Magia_X/
part 3 soon

BTW, why not?
https://store.steampowered.com/app/1148590/DOOM_64/

https://store.steampowered.com/app/343390/Elementary_My_Dear_Majesty/
https://store.steampowered.com/app/1304550/Progressbar95/
https://store.steampowered.com/app/1225560/Unravel/
https://store.steampowered.com/app/1321400/Diesel_Punch/
https://store.steampowered.com/app/1013070/Estellium_Legends/
https://store.steampowered.com/app/1367950/Aeloren_Tactics
https://store.steampowered.com/app/1038740/Fluffy_Store/
https://store.steampowered.com/app/1115780/The_Almost_Gone/
https://store.steampowered.com/app/887900/egg_is_broken_heart_is_too/
Part 4 and the last in the same time probably soon

You've got a stack of unplayed games already, shouldn't be needing more games :P

https://store.steampowered.com/app/245170/Skullgirls/
https://store.steampowered.com/app/1308250/Knight_Bewitched_2/
https://store.steampowered.com/app/390610/Circa_Infinity/
https://store.steampowered.com/app/955050/Bright_Memory/
https://store.steampowered.com/app/970600/Paranoia_Deliver_Me/
https://store.steampowered.com/app/417410/Northern_Tale/
https://store.steampowered.com/app/1096210/Mekabolt/
https://store.steampowered.com/app/415850/BAD_END/
https://store.steampowered.com/app/746510/Duck_Season_PC/
https://store.steampowered.com/app/549190/Fetch/
https://store.steampowered.com/app/335190/200_Mixed_Juice/
https://store.steampowered.com/app/1048540/Kao_the_Kangaroo_Round_2_2003_rerelease/
https://store.steampowered.com/bundle/15302/Orb_Chambers__Buried_Chambers_Limited_time_bundle/
https://store.steampowered.com/app/568040/Macbat_64/
https://store.steampowered.com/app/960090/Bloons_TD_6/
https://store.steampowered.com/app/251870/
https://store.steampowered.com/app/963770/Welcome_To_Chichester_1Redux__The_Spy_Of_America_And_The_Long_Vacation/
https://store.steampowered.com/app/834150/Glare1more/
https://store.steampowered.com/app/1172510/Unlock_The_King/
https://store.steampowered.com/app/925440/__Floral_Aroma_in_the_Shrine/
https://store.steampowered.com/app/327410/A_Bird_Story/
https://store.steampowered.com/app/1207400/Klym/
https://store.steampowered.com/app/1134630/Pear_Quest/

There should be something for everyone

i think ill bookmark this

Mirror is a pretty good VN +18 content with some fun match-3 gameplay.

Skullgirls is a very nice fighting game, with cute art (but is hard af, jesus)

Neoverse is an amazing deckbuilding game, with super addictive mechanics and beautiful overall (not so cheap on Steam itself, but you can find it cheaper on reseller sites, not even grey market ones).

Monster Prom and Monster Prom 2: Monster Camp are really fun, casual and relaxed dating-sims/VNs where choices matter. One of my favorite franchises, definitely recommend a look.

Muse Dash is by far my favorite rhythm game, I have it both on mobile and PC and it is always a blast. Really great music, simplistic but great controls and 11/10 overall. There is also a reasonable music selection even without the all music pack DLC, and every week there is a new selection of free music.

Castle Crashers is one of my favorites coop games, there are great RPG elements, good visuals and story and it can also be played solo, very worth it.

Super Time Force Ultra (STFU) is an innovative platformer, with very funny jokes and good story/plot twists.

100% Orange Juice (and its universe in general) is a digital board game, based on cards, battles and dice. The game is super fun, there are tons of characters, even without the DLCs (which are all worth it) and the replay potential is infinite. Every character has its own story, and then there is multiplayer, where most people are super nice to be around and hang out. There are coop modes, free for all modes, every other month or so the dev team launches a new event with new maps and stuff. It really is one of my fave games, I should play it more (if anyone here has it and wants to play it, hit me up and we can try to schedule!)

Unloved

sleepin dogs - one love. old but great game.

i reccomend gears 5 on a sale
campagin good , and very active multiplayer ( crossplay with xbox )
i play it alot

https://store.steampowered.com/app/360740/Downwell/ is extremely fun for only $2.99 usd

https://store.steampowered.com/app/335830/Distant_Star_Revenant_Fleet/
https://store.steampowered.com/app/278590/Heroes_of_Legionwood/ with the DLC, which are more like the 2nd and 3rd games in the series
https://store.steampowered.com/app/250400/How_to_Survive/
https://store.steampowered.com/app/340050/Survivalist/
https://store.steampowered.com/app/1054510/Survivalist_Invisible_Strain/
https://store.steampowered.com/app/108110/Starpoint_Gemini/
https://store.steampowered.com/app/32370/STAR_WARS__Knights_of_the_Old_Republic/
https://store.steampowered.com/app/208580/STAR_WARS_Knights_of_the_Old_Republic_II__The_Sith_Lords/
Most stuff by https://store.steampowered.com/developer/astronomicgames

https://store.steampowered.com/app/418530/Spelunky_2/
https://store.steampowered.com/app/269210/Hero_Siege/
https://store.steampowered.com/app/386940/Ultimate_Chicken_Horse/
https://store.steampowered.com/app/736260/Baba_Is_You/ got it recommended from my friends, maybe i'll snag it on the next sale
https://store.steampowered.com/app/105600/Terraria/ one of my favourite games
Saints row 3
https://store.steampowered.com/app/274190/Broforce/
https://store.steampowered.com/app/359350/Defunct/
Flatout 2 / Ultimate Carnage
https://store.steampowered.com/app/367520/Hollow_Knight/
https://store.steampowered.com/app/300380/Road_Redemption/
https://store.steampowered.com/app/212480/Sonic__AllStars_Racing_Transformed_Collection/
https://store.steampowered.com/app/350910/Streets_of_Fury_EX/
https://store.steampowered.com/app/251430/The_Inner_World/

Cyberhunt
Great for relax, i usually playing this while listening to my favorite music

Muse Dash
Lot of great music for only cheap prices, it's not complete with the dlc but the base game itself has many enjoyable songs

I think you need to define cheap and the genre first. I don't think that 13.99€ is cheap, hahah.

With the current discount https://store.steampowered.com/app/418240/Shadow_Tactics_Blades_of_the_Shogun/ is a pretty good pick now aswell.

Allkeyshop everything can be cheap ;)

from those of games in my library:
https://store.steampowered.com/app/399820/Kopanito_AllStars_Soccer/
https://store.steampowered.com/app/263980/Out_There_Somewhere/
https://store.steampowered.com/app/353090/Chicken_Invaders_5/
https://store.steampowered.com/app/102840/Shank_2/

100% orange juice is my favorite "cheap" game. I have almost 200 hours on it and still go back to it and play all the time. Great community too.

Warframe is an amazing FREE game!! So much fun. Of course I have spent money on the game because I support the dev team but you don't have to! I have over 1000 hours on it :)