There's so many cool things to talk about with this game, it's clear a lot of time and effort went into it. I really like the starter gun playing notes along with the soundtrack. The art is beautiful and watching that little guy carry around a massive gun is hilarious! And the way it effects your movement, opening up new areas but limiting your mobility as well, it's a really cool concept I don't think I've seen before in the metroidvania style game loop.
Amazing job!