The music is cool. It is a little bit akward for a platformer in the clouds but I like it. The graphics are interesting. The blue cloud sprite especially. I like it. I think the graphics would look even better if it had a consistent pixel density.
Btw. a quick tip: In Unity in the import settings of a sprite you can change the texture filtering to point. With this setting the pixel art sprites wouldn't be blurred.
I didn't like the level design. It was really frustrating to have to do blind jumps all the time. You already explained that this was intentional. For me it was just frustrating.
Overall a solid jam game. Congratulations for submitting.