Great idea and even better music! Like the gameplay though I would appreciate if it were faster to move the UI so to make the controls more responsive. I like the enemy variety and I didn't find the game too difficult. The health bar is unintuitive however and only figured out how to use it due to another comment. I also suggest the implementation of more SFX like hurt, UI, game over and enemy ambient sounds.
My favourite parts of the game are probably the music and how you can use yourself and the UI to block/distract enemies from the Debug Core. (My highscore is 350 I think.)