Well done!
I like the art style a lot and I think that the camera effect is really cool, do you know what it is called, I would like to learn how to add it in my games as well.
I think one way the platforming could be improved would be to zoom the camera out, because right now I often found myself taking a leap of faith hoping to land on a platform that I couldn't see. I also seem to get stuck on the edges of the platforms, so maybe adding a slippery material to it could make this less frequent. But nice job for being your first game jam :D