Single player

Jump or Double jump - arrow up
Move sideways - left/right arrow
Pick up weapon - down arrow
Shoot - z
Switch weapon - x

Two player

Player 1

Jump or Double jump - w
Move sideways - a/s
Pick up weapon - s
Shoot - c
Switch weapon - v

Player 2

Jump or Double jump - arrow up
Move sideways - left/right arrow
Pick up weapon - down arrow
Shoot - k
Switch weapon - l