People often ask for ideas for games. Here is one - a two player game of pool with no pockets, where the idea is to make the white ball touch your balls and not the opponent’s balls.
https://www.youtube.com/watch?v=S7Pjdi3KaBM
I have found this game a lot of fun to play.
There could be lots of variations on this, such putting obstacles on the screen, creating a death zone where you can push the opponent’s balls to die, scoring based on the numbers on the balls, etc.
So often, all you need to do is think of a slight varation on a well known game, and just go from there…
The Code is here.