Move with arrow keys or WAD. Throw a tennis ball with down key, S or Space. You can't move when you're on top of a rock or a tree, only jump forward. Its game over if you get hit by an enemy, water, acid, lava or a lightning. Your score increases when you defeat enemies with your tennis balls or collect the hidden treasure of the desert. Post your best score to the comments if you want to. This game is ENTIRELY randomly generated so each time the game is different. The game gradually gets harder as you progress, enemies spawn more often and more of them can spawn at the same time etc.
IMPORTANT! If you constantly keep getting the exact same screen with rocks/trees etc. in the same positions, try exiting the screen from a different point or with a different positioning. Theres a weird glitch I'm unable to fix that causes the skipping of the randomizing script at times if you leave the screen from certain point(s) when your character is in a certain position. This can be avoided by trying to not jump out of a screen, but rather walking. As an exception, the desert biome has almost nothing in it as a joke, so the game isnt broken if you constantly keep getting an empty screen there.