The idea is nice, I don't know if you have played Teslagrad before, but it's similar in a way that you have to use magnetic force there too.
The controls feel a bit weird, the player movement could be quicker.
The puzzles were enjoyable in my opinion, they were usually just right - not too easy but not too hard.
For the bugs:
I think there was a time when I somehow managed to get the magnet float in the air, next to the side of the wall which had and activated switch in it. When the switch deactivated, the magnet fell back.
I'm not sure if it's intentional, but after pressing the button to restart the level, the black background sweeps in from the left (which looks really cool by the way) then it disappears and appears again for loading the level. It might be better if it stayed there.
Overall, this game has potential, keep it up! :D