Great game feel, excited to see where this is going. A few comments:
1. The robot can't climb the switch without some runup, so if you try from right next to it, you just sputter out. Probably just a speed tuning thing
2. I don't like how the magnet can push you while you are aiming. This makes throwing the magnet while up against a wall difficult. Maybe the magnet could lose its collider while aiming?
3. I don't like having the pick up the magnet in the hub world. It doesn't really serve a purpose, and it's easy to forget, making it tedious to have to go back and get it.
4. Parallax scrolling in the hub world doesn't make sense, since it looks like an indoors space. It isn't in the final 'Thank You' room, but there is another graphical bug when moving in the right half of that room where lines appear between the tiles
5. Aiming with a mouse is fine, but I was having trouble using my built-in trackpad. It wasn't nearly as smooth
All in all though it's a pretty tight experience. Very fun to move around and interact with all the different components. Great work!