UP & DOWN ARROW: Go up and down SPACE: Shoot Getting hit by attacks will decrease the time til the universe collapses. So avoid that. If the universe collapses and Asriel isn't defeated, then you lose.
All coding by me, except for the shooting, which is from @ShopkeeperMagolor. Go check them out. All pixel art by me. Music is "Servants of the Scourge" from Terraria Calamity mod.