Attention Very Serious gamers! Here are the controls:

WASD - Movement

R - Reload

LMB - Shoot

Escape - Main Menu (don't worry, your floor is saved unless you close the game)

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Customize your revolver's chamber by clicking the bullet icons in the center of the screen to select one, and then click a bullet in your inventory on the right hand side of the screen to swap the two.

Tip: jump and shoot the ground beneath you with the concussive bullet for a jump boost