i greatly recommend you play in full screen 

all music is royalty free

i have i small confession only the ui showing the wave increases and it doesn't make enemies spawn faster over time and the game gets easier over time rather then harder. sadly i only realized this after voting started sooo just pretend that instead of the game not having a difficulty curve, pretend that you are just really really really really good and learning faster then the game giving you challenge.  if you really want to play my game without this problem you may find it on unity play as the same name however if you do DONT make it effect your ratting. as I think that is against the rules of thatgamejam.