Nice one! This demo of Untitled Magnet Game is a well designed puzzler with "Aha!"'s and other great phenomona. The difficulty curve was set at just the right level to give people time to learn the controls, the interactions they can create and the different situations that can lead to interesting and seemingly contradictory catches.
There is one thing I would suggest, which is changing what happens when you re-enter a level. Classic puzzlers usually have little differences when you replay a level, with the only new goal being optimisation. A cool idea to implement would be that you are transported to the beginning of the stage, only, the pipe spits out 2 magnets, 1 north, 1 south and both unswitchable, and the level becomes one of resource management.
This idea does come with a few drawbacks though, with it removing one of the core mechanics that are used throughout the game, which would be the equivalent of Celeste's B-sides removing the dash and adding infinite stamina: the game removes the core mechanic.
This game, no matter what direction it takes, seems to be a fun, intuitive and engaging puzzler with very promising groundwork already laid. Good job!