Basically you use the arrow keys to move, the monkey throws bananas at you and you have to dodge them, they will go to you twice and then back to the monkey, every 30 seconds it gets harder. You have 9 lives BTW. The bananas deal knock back just so you know. You also have a highscore and difficulty variable I haven't explained yet, difficulty ups every 30 seconds and is how many bananas he throws, higscore is pretty straitforward and you have a high difficulty to.
The monkey takes a bit to throw the first banana so be careful.