Player one(P1) use IJ and L to move, K to attack while touching the other player and O to use a smash attack, you can also use another smash attack while touching the other player by pressing U. Player two(P2) use WA and D to move, S to attack while touching the other player and E to use a smash attack, you can also use another smash attack while touching the other player by pressing Q.
You can use this engine in one of your games, just give me credit.