Really cool! Very addicting. I love the power-ups, and the core mechanics are implemented great! I also love the addition of a combo multiplier, it adds a lot of depth to an otherwise very simple game.
A couple of suggestions. I think it makes more sense if the magnet turns the opposite color of the side it's attracted to (since opposites attract). And I would've liked to see the magnet move left and right! Although maybe that would've made the game worse, idk.
Anyway, great job dude! Definitely one of the better games in the jam. :)