Very fun game and the addition of a hub world is a really nice addition. The music is good too, and I swear I recognized part of it, and I eventually found the song "Auld Lang Syne" which all the music seemed to have a portion of from, which was really cool whenever it popped up. One small thing I would recommend is adding a button or something to exit back to the map because I accidentally reentered a level once and couldn't find a way to leave without beating it, so I just refreshed the page to get out.