It's kind of cute, and as I'm listening to other music, I put the game on "mute", so no opinion on the music of the game. However, I think the game suffers from a few flaws.
First of all, it's quite weird to have the character that huge (relative to the game window). Maybe, IDK, unzoom a bit? :)
Then, there's the problem of the character sticking to the walls. He can even jump again from the walls.
Also, the double jump. It has become a trope in platform games, but does your game really need a double jump? In my opinion, it doesn't, and the double jump you implemented is quite tiny anyway. I don't think the game would have been really different without it.
Finally, the level design is quite weird, especially because of the floating spike blocks.
Still, a very good first game :)