Move around with LEFT and RIGHT ARROW KEYS and chainsaw stuff with SPACEBAR. Make your way to the other end of the floor to continue.
You are one angry kid with skull mask.
Square Enix has launched their Dragon Quest 8 Official Community website called SlimeKnights. I'm a huge fan of the series, literally the second console game I ever played, after the original Super Mario Bros. game, was Dragon Warrior I (since you couldn't avoid playing Super Mario Bros. - it came in the Nintendo box).