The concept of enemies based on your movement is great. However, I think it would work better from a top down perspective. That way you don't have to fight gravity and the environment, which gets kinda frustrating. I really like the art and the sound. It's just that the movement isn't all that fluid; I'm constantly getting stuck in the level. I also wish I could jump with W.
Whenever I failed, the main menu would show again. However, if I then pressed start again it didn't reset the scene. It would just show the scene from when I failed. So, it was best just to ignore the UI and press R to restart.