After downloading, rename GMTKGameJamProj_Data to MagJohn_Data and you're good to play.
I like the concept; using toggleable magnets on all fours sides of John to move about a level. It offers a lot of potential in level navigation, especially with buttons and activatable platforms.
I can tell that snapping platforms and magnets so that they're consistently connected is tricky design-wise, I had my little robot fly out of the level because it was tilted diagonally while moving.
Overall neat idea and nice aesthetic!