I enjoyed this game. I wish there had been more of it. I also really enjoy seeing more Godot games in the jam.
I found the game a little tricky at first, because all I did was read the bottom of your instructions on this page. I didn't see there was double jump. So I skipped the tutorial. After that, it wasn't too hard to beat the level.
And as others have said, I don't think the music was really synced to any of the platforms, but I think with a little work you could get that done for real, and have a pretty neat game.