Use the arrows to jump and move. Don't touch the spikes. The glitch where you can jump after you die is intentional.
Update log: V.1: Made the game V.1.01: Fixed the second spike not working V.1.1: Made the background, ground, changed how the spikes look, changed how the cat looks, and changed some code. V.1.5: Made a new level/addition to the game, changed the code, made a losing screen, and other stuff that I forgot.
