The game is nice, but it looks like it's impossible to lose if you just hold space and go back and forth.
My suggestion would be to add enemies that have more than 1 hp.
The sound and the visuals are well done by the way!
Thanks for playing my game! I wanted to add more difficult enemies, that would attack as you progress through the game, but ran out of time. Your idea might be better, to add hp to the enemies as time progresses.