This a solid platforming game!
I like the idea of the character, they seem pretty cool and there's a lot of potential for wind-based attacking. I do wish there was some sort of narrative or at least a basic story/mission, but that's hardly a game-jam requirement.
The artwork, while rough, actually looks pretty nice! I like the overall style and atmosphere. It could probably be cleaned up a bit, but I actually don't mind some of the simplicity, especially the backgrounds.
The gameplay was fine, but it could also probably be improved... tighter controls, more attack options, moves, etcs. The basic enemies were really easy, but the boss crushed me at first! On my second play through I did find a rhythm of jumping and attacking that worked pretty well, but I still just barely defeated it.
From a mashup standpoint, it did feel a little light on the SHMUP elements. I'm not sure the best way to make it feel more SHMUP-y. Maybe faster attacks, more projectiles to dodge as you move through the level? As it stands, I think it's enough to be considered fulfilling the requirements, but it could be pushed further.
Overall, for a first game-jam game, I think this is great work! There's a lot of good stuff here, and tons of potential to expand on. Keep it up!