The art style is really nice, and I love the animations. Small details I've not seen before — like the visually shaking effect when you’re near the edge — is fantastic. I’m not entirely sure how I managed to jump so high even when double jumping onto the cloud! but it felt awesome and makes sense with the platform being something you can jump through while the other solid ones you can't.
The creative level design and the help you get while playing is very good. It’s challenging but fun, and it encourages exploration. One small suggestion would be to add a fullscreen option. Overall, a nice looking and enjoyable platformer.