It took me a while to work that out to. You can add players by pressing these keys:
P1: left arrow ,right arrow
P2: left ctrl ,left alt
P3: Q,W
P4: numpad 2,3
P5: O,P
On button sets the player as a bot, the other as a human controlled. I think that there may have been a problem when I ran the program as there was a few flickering rects on the screen. The game seems like it would be fun with lots of people but I think it needs some more work done on it first
