Thanks for playing and for your helpful comment! I agree the boss can be too hard if you don’t collect all the stars.
As for showing the boss’s health, I actually left it out as a nod to old platformer games on the SEGA and SNES, but yeah, having it visible would definitely help the player.
And about the music . yeah, it bothered me too! But, thanks to my amazing planning, I ran out of time to fix it :)
There was a check button in the corner that I assume you missed probably because it wasn’t bold enough.