Arrow keys or WASD to move. Z to use string cheese grapple (when unlocked). C to pick up items/interact Space to attack Top bar is health. Bottom bar is calories. Health regenerates faster the more calories you have. If calorie bar is empty, you gradually lose health. Refill calorie bar by killing enemies or finding food pickups. Enemies do not deal contact damage unless attacking.
This is just the first 2 areas and a little bit of the 3rd. hope you enjoy!