Movement:
Player 1 (single player): A, D, W
Player 1 (multi player): A, D, W
Player 2 (multi player): Left, right, up keys

Shoot:
Player 1 (single player): Space bar / left mouse button
Player 1 (multi player): Space bar
Player 2 (multi player): Enter

Turret gun
Player 1 (single player): N, M / scroll
Player 1 (multi player): N, M
Player 2 (multi player): 1 , 2