Thanks for the valuable feedback !
The cube not spawning after being destroyed is a bug. Unfortunately, I can't seem to figure out how to release patches to the game without re uploading the entire game (None of us know how to use Butler and I don't want to risk disqualification from the Jam. Sorry :( ). But I will update the game after the Jam is finished.
Also about the music loop, I will let the composer know and we'll see if it can be made a bit less repetitive and more interesting.