Please recommend incredibly awesome games you can buy for $1 before the end of the sale

I don't have a specific suggestion, but you can use sites like gg.deals or steamdb.info. You can sign in to your steam account if you want and then have it only show games that you don't own. You can use filters to select a certain price range or discount amount and then sort the games by the steam rating. This will show you the highest rated games on Steam that you don't own and cost less than $1 or any other price you want.

https://store.steampowered.com/app/657200/Hand_Simulator/
https://store.steampowered.com/app/322170/Geometry_Dash/?snr=1_7_7_ut2_150_13
https://store.steampowered.com/app/434570/Blood_and_Bacon/?snr=1_7_7_ut2_150_19
https://store.steampowered.com/app/3590/Plants_vs_Zombies_GOTY_Edition/

Several of the old Tomb Raider games are less than a buck right now

Initially, I wanted to buy Divine Divinity to sync with GOG Connect however because they seem to be good Devs and the whole Divinity Anthology is not too expensive. I ended up buying the package instead. Older but quality game I suppose. Cheers, Cruse~

Analogue: A Hate Story (Visual novel) Awesome sci-fi story based on the culture of the medieval Joseon Dynasty. You're tasked with discovering what happened to an abandoned spaceship by sorting through its records with the help of the ship's friendly AI.

The Dream Machine's First Two Chapters (Point & Click Adventure) A handmade claymation adventure game in which the main character traverses through dreams with the help of a mysterious machine.

https://store.steampowered.com/app/11450/Overlord/

https://store.steampowered.com/app/873200/Teleportals_I_swear_its_a_nice_game/
https://store.steampowered.com/app/311870/Super_Trench_Attack/

Swarmlake, if you want a score chaser FPS like Devil Daggers.

https://store.steampowered.com/app/644560/Mirror/

If you like visual novels, Analogue: A Hate Story is an amazingly well-written game that I highly recommend. It's currently US$1, and well worth it.

Incoming Forces
Gun Metal
Hostile Waters: Antaeus Rising

Postal

CuberPunk 2089

https://store.steampowered.com/app/6200/Ghost_Master/

The Hexcell games are awesome if you are into puzzles.
Or The Room, though it's a bit more expensive, 1.25

Deus Ex 1+2
various Tomb Raider games
Anachronox
Gorky 17
A New Beginning
Undefeated
A Bird Story
The Silent Age
Broken Sword 1-3
Deponia (if you didn't pick that one up for free)

Staff picks @ Fanatical:

https://www.fanatical.com/en/pick-and-mix/staff-picks-2018

You can pick from the list:
1 game for 1.05€
3 games for 2.59€.
5 games for 3.69€.

Hero Siege
Oh my Gore

Dishonored kinda cheap

Superflight - $0.74 - Overwhelmingly Positive reviews - low-poly wingsuit flying game:

https://store.steampowered.com/app/732430/Superflight/

Terrorhedron - $0.49 - Very Positive reviews - tower defense game with co-op

https://store.steampowered.com/app/299720/Terrorhedron_Tower_Defense/

Watch This! - 0.39€
Virginia - 0.99€
The Crow's Eye - 0.79€
Rusty Lake Hotel - 0.99€
Startopia - 0.83€
Devil In The Capital - 0.99€
Goodbye My King - 0.41€
Through Abandoned - 0.49€

They may not be all incredible but they're indeed good games and I'd buy them all at that price if I had any funds left. :)

Deus Ex.