An outstanding platform puzzler! Graphics and music are top notch, and I absolute adore the animation of the rat magnetizing things below.
The mechanic is great, and seeing it happen is super satisfying. Definitely one of the best games I've seen so far. Hopefully more people get to see it!
For improvements, I noticed that the physics were a little wonky, and it was easy for blocks to get stuck in somewhat diagonal positions.
The level designs were interesting, but on a few of them, I solved them without using all of the level's elements. On the one level with the long passageway leading to the two sets of magnetic platform blocks, I skipped a huge part of the level by just managing to immediately get the jump boost block down below and jump up to the top right away.
The biggest suggestion for the mechanics would be to not consume the projectile ammo unless it actually connects with something. Consuming it upon hitting the wall seemed overly punishing for a puzzle game, and just required a level restart for no good reason.