This game was excellent. The graphical style is perfectly creepy, and the music fits that as well. The concept is fun and well-implemented. The controls feel snappy. The only thing that kept it from getting a perfect score is that with the enemies spawning at seemingly random locations, they tend to sneak up on you way too easily for a game where you can only take one hit. I bet you could rectify this pretty easily with some audio or visual cues. Perhaps some spawn sounds or impending doom sounds as the enemies creep up on you would be useful.