I like it! It's a fun use of the theme, and you have a lot of mechanics which all build on the central idea to keep the player from getting bored. The grabbing onto a platform is not intuitive at first (it could use a better explanation) but once you actually figure out what it means, it is a fun way to interact with the world.
My biggest problem with this game though is the controls. Trying to keep track of everything going on in the game is already enough, I don't want to have to keep track of which of my fingers has to hit which button at what time-- that part should come naturally. Between the magnet switching (z), platform grabbing (x), and jumping (space), I would often end up hitting the wrong button, especially on the difficult later stages where you have to juggle between them all. A simple fix that would go a long way would be to allow the player to use up to jump! Then movement would be relegated to one area, and instead of feeling like you have three 'special functions', you only have two, since jumping is just part of your regular moveset.
This is a nitpick though, and while it's a definite way to slightly improve your game, I wouldn't have put this much thought into it if I didn't enjoy it. Nice work!