If you don't kill a snake or shark in 100 seconds they might heal. Arrow keys to move (I took the walking thing from Earlobe7, that's all I took) C or X to interact. Z to sprint. Press buttons to activate. Bite does 15-25 damage at random. Normal Scratch does 20 damage. Growl does... nothing.
Changes for V5: Enemies don't get one attack after dying. Changes for V4: Compatible with mobile. Changes for V3: Fixed some bugs. I changed the music a bit. Made it so you have to go to the gate with the key. Bugs: Unknown.