Nice work!
The feeling of controlling and moving is pretty good. I think it is the hardest and most important part of platformer games.
I also like the layout of its levels. It gives me the feeling of exploration. I need to walk around and search for jams or the path to get jams. The only thing making me a little bit frustrated is that sometimes I can't see the next platform I need to jump onto. But overall, the levels are great!