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
  
• both players using a controller each

If you own a controller that does not work with the game, please let us know.

Greetings everyone!

Happy Valentine's Day! We are more than happy that the DoS launch is finally here!

We know many of you are excited for our online co-op feature, and so are we! We’re working on a patch right now that will allow you to play with your friends online. We’ll keep you updated on our progress! Thanks for your patience everyone!

Unleash the powers of hot & cold to solve puzzles and embark on a journey with Ember & Rime in the visually sensational world of Degrees of Separation, launching Valentine's Day!

https://www.youtube.com/watch?v=pwfvFQRYpOk