Thanks a lot for the awesome review, @antti-haavikko !! Was my first time working with libGDX and Box2D so I was learning a lot as I went, haha.
I had a pretty annoying time trying to fine tune the player physics because I was always fighting the physics engine. That's why some of the movement is a bit derpy. I'm sure I could get it just right if I poked it a bit more, haha.
The intro animation GIF decoder was unfortunately bugged, but we'll be pushing an update with some bug fixes that addresses that!
I'm impressed you did that jump on the first level, there was nothing up there because you're not supposed to be able to reach it! I added some goodies up there, since it is indeed possible, apparently!
I've already taken your feedback into consideration and made numerous improvements that will be available in the next release. Thanks a bunch!