One thing that i want to point out, that so far i didn't saw anyone in the comments point out is that you don't have really a reason to move, other than dodging enemies, which it doesn't happen until at later levels of the game, when the enemies become more and more stronger. Also i think that the enemies become a bit too strong each level, i had difficulty dodging them all with how many enemies were on screen :/
Really cool concept tho!! I like the Music(s) in the game!! Good Job!!