It's a two player game
There's just one rule: Push the ball into the net of your opponent
Each session lasts 2 minutes.
Pushing the opponent's player is allowed and part of the game, and since you both would be standing so close to yourselves playing with this tiny keyboard, you can push them physically also... hope I have time to delete this

Controls:

Player 1: Arrow keys for navigation and "L" key to shoot

Player 2: "WASD" keys for navigation and space key to shoot