Start by clicking play. Moving: Use the arrow keys to move. Press and hold "s" to run. If you let go of the s key, you will stop running. You can go to two places, the brick wall, and the rock. You can go different places by going to an edge. Catching prey: "a" to attack, if you are touching the prey. Then if the prey's health goes to 0, you can eat it with "e".
Thanks to Wildcraft for the idea. Everything else I made.