Ooh, this was really fun! The puzzles were well thought-out. I especially liked the final level.
The paths of the chain platforms could be better telegraphed. While it was usually obvious where they would stop and start, it was less obvious when there were four of them with slightly different mechanics.
The impression I get from the types of movement bugs I experienced (bouncing off ledges, moonwalking, falling into a wall and starting to walk despite not being active, bouncing off of the sides of chain platforms, inconsistent spring height, movement speed) is that there seem to be a lot of "physics" getting in the way of the movement. That's only a guess — I don't know how this was programmed — but it feels like the movement and collisions need to be much simpler.
The cover image is great. It has a very old-school video game box vibe, especially in how nonrepresentational it is.
Great work!