Press space to do sword. Press E to use bow. (a little circle should appear when you have full arrow strength. Yes, you have to power the arrows up.) Hold S first and then E to do boomerang. Press Q to us hookshot. Press A and D to move. Press W to jump. Press space while in air to slash. Hold W then space to do an upwards attack. Press S and Space while in air to do a pound attack.
See above for instructions. I got the link sprite and background from google images. I am planning on turning this into Super Smash Bros after I can find a mario sprite.