Kung Fu Strike actually surprised me. The game is just pure fun. The crazy combos you can pull off by only holding a button are always fun to see, and the simplistic nature of the game play makes it easy for anyone to pick up and play.
You may have a struggle in the later levels of the game, but co-op will make that easier for you. All for a low price, I'd suggest giving it a shot. It's a fun little beat 'em up with a lot of heart.