Great music and art! I am a big fan of pixel art and this was well done. I am curious, what tools do you use for your pixel art creation? Aseprite?
Game was a lot of fun too. I thought the levels were well designed, and it was a challenge to get those pesky doors open! I wonder if there could be another move mechanic that would help navigate through the tight opening between blocks, I found my self falling a lot because I didn't quite line myself up with the entrance to a gap.
Fun game!