Love the art! I'm a big fan of dichotomous styles like hand-drawn/digital, 2d/3D, etc. This nails it!
The level design is solid and the movement overall has a nice feel. The floating feel makes the game seems a little slow...not sure if that's a bad thing or not, I personally like a little speed in platforming, but this might be what you're going for and it would be fine if so.
Awesome work!