Click the green flag twice.WASD to move, click to swing your sword selected at the bottom of the screen. IMPORTANT when the game asks for a code (at the start) only us the one you get through the game. Sorry for the lag at the end, its unfixable. TIP The red Sword kills zombies faster, and the blue Sword kills bosses faster. I will always be updating this for the year-ish.
I used the same-ish program for movement from "Ghost World" by ipodlover3354, and music from Sockman's "Computer v1", "cat civilization" by craZcat, Brightpawquest's "Warriors The Game!!!-kit", and Broguy's "Shy Guy Troop: Ep.2 The Search". These are all great games which I suggest you check out.