I liked the game, but I definitely think it's important to get your main gameplay solid before anything else. There's a very tiny window to the left or right of the bottom magnet that you have to be within, flipping the polarity of the top magnet either completely kills the velocity or reverses it with 100% efficiency, and overall lack of predictability. I think there are two good vectors for mechanics: that which favors realisticness and that which favors the user's experience. However you've managed to engineer the controls in such a way where it falls short of both categories.