I liked the mechanic of only being able to shoot in the direction you’re moving. I think it could be really fun to expand on that and have more situations where you have to turn in midair to shoot behind you or something like that. Your art style is very fun, the only thing I would suggest is to have more obvious contrast and preparation for things like the moving platforms. I really didn’t expect it to start moving when I got on it, even just something like a rope connected to it would probably help players realize what it’s for.
Otherwise this was actually kind of challenging! I got to the boss (?), but it didn’t seem like it was killable, so I figured the game just ended there.