Thanks!
I personally didn't think the menu music suited the game itself, but that's probably more subjective than anything, I'll keep that in mind.
The game is also harder than I wanted, it's obviously much easier for me because I did it, so I didn't calculate the difficulty that well.
I also never thought my level design was good, of all things. It actually kinda stresses me out to do, and I put it off as much as I could. Although that's probably because I'm way too perfectionistic with it, so it makes sense.
But, if you want music in the game itself... you could maybe try solving the easter egg ;), (although, like with the game itself, I didn't gauge its difficulty that well, it may be much harder to solve than I wanted) All clues are in the description...