I'm using INNEXT SNES style controllers. I can force them to send keyboard inputs through steam configs. But sadly, I cannot play with the keyboard either. With keyboard i can start the game holding enter but then the attack wont register in-game. Only directional inputs. Oh i just noticed you said N+M are the other controls. The player start screen displays enter and spacebar for controls so nowhere in the game does it mention using the N+M keys. That may be why I can't play.
Yes. I just confirmed that it's playable using the N+M keys. Thank you. If there were key bindings for player 2 on the keyboard I could set up controller 2 on those keys. But for the general player audience, having both controllers work as gamepad/joystick type inputs would be better.
I just tried using Steam settings to make the gamepad to act like keys and bound them to WASD, N and M. Now in the player select screen pushing any button makes the keyboard appear under player 2 but I can't start the game. So currently i can only use the actual keyboard to play.
Oh and I'm running the latest version and using Windows 10.