Looking for low spec 2D games

Have you tried NEO Scavenger?, not a dungeon crawler tho, but very similar concept

Just started playing Questr. So far, so good. Similar to Reigns but with a few more options. You might also be interested in Boss Monster.

Tomb of Tyrants - Tertris meets Dungeon Keeper
Death's Hangover - pong with crazy story
Undertale - unique RPG on so many levels
Another World - classic
Wizorb - another pong with RPG elements
Gunpoint - stealthy brain-teaster, awesome jazzy sountrack
10000000 - match 3 game
We Must Build a Boat - second part of above,
Hack, Slash, Loot - my first 100% achievement roguelike
Hotline Miami 1 and 2 - like good old GTA, but without cars and with great sountrack.

I hope this helped.

I think no one suggested Lisa the Painful, it's a great game. Also Hotline Miami games are really good. And if you like metroidvania genre, you should check Hollow Knight.

FTL goes on sale often, for around $2 so it's a great deal.
I'd also back Dungeon of the Endless though it's kinda hard dungeon crawler.
Gunpoint is an amazing short little game, not a dungeon crawler.

Err... no one mentioned LIMBO?

I'm gonna second someone's suggestion on Stardew Valley. The graphics were ok to me at first, but they grow on you. The content is also surprisingly long for a $15 game made by 1 person.

I don't know if these are 2D or not, and they certainly aren't Dungeon Crawlers, but they did run on XP & do run on Win 7 (256 mb ram & 4GB respectively) without a GPU in either case--we just had the integrated chips on the low-end machines. They can run on basically anything.

• Civilization III Complete Huge mods for this may strain your PC. Many do not.
• Railroad Tycoon 2 Platinum

Cally's Caves 3
maybe?

Recettear: An Item Shop's Tale (and probably the rest of the Carpe Fulgur collection though I can only speak for Recettear from person experience) sound like they would fit what you're looking for. They go on sale pretty often so it's easy to get them cheap.

The Binding of Isaac (or probably better- its remake) has pretty low requirements if you're looking for something less anime (and more annoying with it's obnoxious levels of useless item RNG). Similarly- Enter the Gungeon (though I haven't personally played that one).

Legend of Grimrock maybe?
The Bard's Tale is also really good though it's more of a standard RPG than a Dungeon Crawler.
Also I guess Dungeons of Dredmor though, again, I haven't played it much to give a strong opinion about it.

I can think of a lot more good 2D games with old-school graphics (and thus low requirements) but that would take too long so I tried to limit myself to the Dungeon Crawlers. ^_^'

Door Kickers

Just a little bump, 'cause I think the topic's interesting and I'd like to see more replies. :)

I have a low-spec computer so I know the struggle. My recommendations:

Mini Metro
Superflight
FTL
Nuclear Throne

I got an email earlier this week that The Curse of Yendor is on sale. 2D rouge-like, if that's your thing. I think I saw some dungeons in the screenshots

Sword of the Stars: The Pitt

One of my all time favorites, been playing previous iterations of it (Space Rangers 2, Space Rangers 2: Reboot) since 2007, it's one of those games that has several genres combined within it (open world RPG, RTS, text quests), but unlike most other games, this one does it well, and has amazing replayability.
Space Rangers HD: A War Apart

Salt and Sanctuary

not dungeon, not survival but theme hospital. You can find it on gog or origin

Tales of Maj Eyal

Sorry guys, was busy with work. Thank you all for your suggestions, I'll read all of them carefully.

thanks everyone i added many games to my wishlist and some to my cart

Fallout 2 is one of the best game ever. I always recommend it for lots of hours of low-end gaming fun.
Also, this one is pretty low-end :)