Player 1: WASD to move, F to wrench, G to jump.
(In one-player mode, Player 1 can alternatively use K and L to wrench and jump)
Player 2: Arrows to move, M to wrench, Comma to jump.
Press W or UP to ride robots (when gauge is at least 70% full)
Press 1, 2, 3, and 4 on character select screen to toggle bonuses you've unlocked.