The prize is your game and the satisfaction you get when you complete it :)

I'll send you $5 worth of Bitcoin cash (0.0081 BCH) if you (just AikertDEV cause they asked, nobody else sorry!) send me your game and your Bitcoin Cash wallet address when you're done! You also have to give me a little feedback on my game too :) Just reply to me with that stuff later when you're ready, and I'll send over the BCH. How's that for incentive! But yeah most (especially small) game jams don't have any special rewards other than the satisfaction and experience you get out of them.