This is a really excellent game -- the artwork and animations are fantastic, the mechanic is creative and well designed, the game plays smoothly, and it's very challenging. This game took some practice and investment, but I was happy to keep playing and I finished all of the rounds. Really good job.
Because the game is challenging right out of the gate, I'm afraid you may lose some players early on (particularly because in a jam you will have players of varied tastes, and not just those who seek out difficult platformers) -- and it might be good to ease players of all tastes into the mechanic with some easier tasks. If you develop this further (I'd happily come back for more levels), there seem to be a few places (e.g., in the middle platform on Level 5, on the left side of the platform) where the player sometimes gets stuck on surfaces when trying to slide laterally, as you sometimes see if a collider edge is sticking out (it might also have been an interaction with the NPC on that part of the platform). It's a very minor fix in an overall excellent game.
Great job!