Player 1
WASD or ZQSD to move - Space to jump - F to shoot
Player 2
Arrow Keys to move - L to jump - K to shoot
Hold your respective jump buttons when hugging a wall to climb it
Hold crouch and press jump to roll
P for fullscreen
1 to toggle rain
Credits
Mechanics : Agent Y
Art : sugarcube aka Baron Wasteland
And thanks to the entire flowlab community