As others have said: The game feels fantastic when it flows, but when you accidentally loose your momentum and have to do multiple jumps, the slow "fire rate" gets in the way of the enjoyment. I liked the interpretation of the theme, but I wish there had been no cap on firing, so as to allow the player to drain themselves completely!
The music was, just like the rest of the aesthetics, simple but effective. This feels like it could be ported directly to mobile and no one would bat an eye.
All in all well done!
(Jeg gætter ud fra dit navn, at man måske også kunne sige "godt klaret!" ;) )