Excerpt from the help screen I am adding in the next version:
"Control character with the mouse or keyboard (WASD or arrow keys, drag mouse). Control key/left click fires, space/right click jumps, alt/middle click crouches. Walk over to pick up items. Shotgun reloads automatically. Home [changing to Backspace] key resets the game. Esc quits. Hidden keys abound. The Count appears after five minutes."