Welcome to the world of SSB: Fantasy! This is not done, so you can only play as mario. arrows to duck and move, z to jump, a to block / airdodge, x for normal attacks, and c for specials (changes based on arrow keys pressed). This only has three stock battles right now, so defeat the CPU (link) three times before he does.
@SpritePlatoon for food sprites. Mario, Link, Super Smash Bros. , and the music are owned by nintendo.