Use the WASD to control your character and the cursor in character selection. J for attacks and tilts/aerials. K for specials. L for shield. ; for grab.
This is in alpha. If you have a character you would like to see in this game other than the ones staring in the original Super Smash Bros, let me know. I will be adding in some personal favorites, such as Bowser, Captain Falcon, King Dedede, and Cloud. Grabbing mechanics and shielding probably won't be added in until much later in development, and same goes with ledge grabbing.