Things I liked: The music was catchy! Even though it was the same looped section, I didn't find myself annoyed by it, which is exactly what video game music should be like. I also enjoyed the concept of destroying enemies to control the environment, however...
Suggested improvements (Just my opinion. I won't be offended if you don't take them.): there was no tutorial, no menu, or controls given for the player to understand how the game works. I found myself unable to destroy any enemies because the game gave no context on how to do it. The only real improvement I would suggest is to add an opening menu, or some simple explanation, before dropping the player into the world.
Overall great idea! I was intrigued by the way you tackled the limitation. Good luck!