Nice! Love the Art and the little UI you done. You manage to vary the level with only 3 wall/ceiling/floor texture which was smart. The idea of speed in a crawler is an interesting one, because it can really affect dodging projectiles and attacking.
The movement felt a little floaty, and it would have been cool if you added a little stutter or shake or slow down on each step, to convey feeling that you walk "steps". Rooms and corridor are also a bit too wide/big for my taste, but on another hand, if you made them smaller, I would have gotten lost without a map.
Nice job on the game!