Really good, I definitely think there is more that could be done with this format but it'd be unreasonable to expect more in such a short time period of course. I liked the jumps where you had to swap mid-air. I think a little work on the way collisions work would make the platforming a bit more pleasant, such as how all vertical momentum seems to be killed when you collide with an obstacle. Also, really liked the decision to have the music kick in as you neared the end of the game, that was a nice touch.