Art is good, though I feel like you could convey the limitation a bit better in the enemy design. The gameplay is fine but suffers a bit from the way enemies spawn and how fast they are. The enemies seem like they have mostly static spawn points close to the player's starting location, and they move so fast that if they get close to you you're basically already dead. I was able to go into a corner so the enemies only came from one direction which made the game a lot more possible to beat.
Could do with a bit of music or sound though.