use the mouse to look around and click to move forward space to shoot destroy the box to start game kill 10 enemies to go on to the next wave collect the purple cannonballs to get cannonballs (your gonna need a lot of them) collect hearts to get hp(your gonna need a lot of this too)
All credit to @duckluck2 My only improvement; a new mystery enemy. He appears once every 5 waves. He is very powerful, but there is a great reward for defeating him. I'll give you a hint on who he is; Sentry down!