WASD to move. Green Hearts heal you by 20 points. white objects damage you. WARNING: This game is VERY hard and contains (small instances) flashing lights. Play at your own risk! Thunder: warns the player of a danger area and attacks said area. Starfall 1: Makes a noise when spawned and falls down the screen, bounces off the floor if not intervened. Starfall 2: Quickly chooses a random direction to choose to fall in quickly after spawning and explodes on contact. Slam Attack: spawns above the player and slams down quickly.
Undertale by Toby Fox. Concept of "Gaster" by Toby Fox.