You are welcome to give critical feedbacks! You can use ctrl+r or "enter->reset cart" to reset the game (but it also reset the level, maybe it could have been interesting to let people have multiple tries at the same level)
For the music, yeah you are right, it was kinda a placeholder at first but I wanted to release the game, maybe I will change it latter. It will still be very coarse as the constraint limits what I can do.
For the "double click proof" at the end, it's a good idea but I didn't have the space (in the 1024 bytes allowed by the jam) to do it, I'm already glad I could show the timer at the top :D