hey giorgio.
Thanks for trying out our game! I'll make sure to check your game out when I can!
Regarding the bug you ran into, we are aware of it and unfortunately it went unforseen until after the deadline for the gamejam had elapsed.
RamblingStranger (another of the devs) details a fix for this below, but we understand this may put us in a tricky spot regarding the competition (the fix does not require a new executable - just a sound import file to get music working the way it needs to).
All that said, if you're interested in playing the game as we had hoped to present it, follow his instructions.
Thanks again for checking us out!