Use the arrow keys to move around. Space bar is to activate the cat cannon. If you bump into the lava, you will lose a point and respawn. The moving creature has an invisible forcefield around it, so you will also be respawned even when you're near it. For the way to defeat the enemy, scroll down. You can defeat the enemy by shooting the cat cannon when you are aligned with it and the enemy is on the right side of the lava.
Remember, this is just level one of this game! I want you guys to remix it and make new levels. Please accept my request. Thanks!