Read the original on Steam ↗The game has been updated to fix issues regarding playing co-op on a keyboard or when playing with a controller+keyboard combo. An important note is that "player 1" and "player 2" use different keys on the keyboard regardless of what setup you use. They are as following:
Player 1
Move - WASD
Jump - Space
Use - E
Call Companion - F
Player 2
Move - Arrow keys
Jump - L
Use - K
Call Companion - J
When playing single player, the controls for Player 1 is used, with the addition of using Q to change character.
If the game does not update for you, you can restart Steam to force it.
Update March 14
To be clear - you can now play the game coop using the following setups:
both players on the same keyboard
one player on the keyboard, one player using a controller