This was really fun! Played for about 20 minutes- if I were to have any critique, it'd be the 4 notes that keep repeating, it gets a little grating after a bit. Also the upgrade shop was a bit underwhelming- you can get all of those things relatively easily by surviving more than 30 seconds
to really boost the overpoweredness, maybe you could have the player be able to destroy nearby blocks for extra money and have that skill be able to level up and the radius + money increased or sm
overall tho well done B)