WASD and Arrow Keys to move. Avoid the bullets. In the second phase, the color that shows in the portal will make the floor of the same color hurt you.
Music (made by Toby Fox) Ruins - Undertale Ghost Fight - Undertale Dummy! - Undertale Changelog V1 - Added a toggle music option in the main menu V2 - Made the floor trap deploy faster, added a sound when you get hurt