Hey, music is great, gameplay is also fine.
I found 2 bugs, sometimes you shoot only to the right even if you are facing left, i think this hapenes after you jump, but not always, i dont know. Also sometimes the bullets slow down for no reason and then they dont even hit enemies even when they are clearly touching them. Weird.
More importantly I quit the game on the TALL level (level 3 or 4?), because I died and it respawned me on level 1.
Please respawn players on the same level they died on, no one is going to be replaying levels that they already finished. >_<