Default controls (can be customized)
Move: right and left buttons
Jump: Up
Dodge projectiles (Down)
Fire: A
Kick: S
Reload: D
Interaction/doors: E

to skip dialog press Interaction, Fire or kick.

to change quality or quit to menu: hover your mouse to the top of the screen and a menu will slide down, where you can change quality or quit to menu.

if you want to customize the controls, go to controls in main menu.
and note for elevator floor selection: it's up and down in the default layout, you will be asked for up, and down will be the crouch button which is obviously down, ps you can mix Up with the jump button in case you jump with up button.