Quick question about the local coop mode

[Achusttin]

Does it work with just one keyboard? Or do you need joysticks in order to play with others? A middle point maybe, like just keyboard up until some players and then joystick for the rest? In any case, thanks for your time :)

[MDL]

You can have two players sharing the keyboard :)
For player 3 and 4 you'll need controllers I think.