Dungeon of EEEvil is a low-res 2D action game in which you play as a knight trapped inside a prison, surrounded by the walking dead that will chase after you if you get close to them. By doing a bit of exploration you can find weapons to protect yourself with, but watch out for ambushes and traps that might be sprung on you unsuspectingly upon entering a new room.

There's a fair bit of backtracking involved, although the game doesn't actually take longer than an afternoon to play from start to finish. (Windows, 1.88MB)