I put the ball in the hole and it said yay, very good!
A downloadable game for Windows
Pool but with gravity!
Left click and hold to hit the ball. R to restart.
Pot all the balls of one colour, then the black to win. Or whatever really. In space, no one can hear you break the rules.
Game doesn't massively check the rules for you, so you could play two player!
Source available here, if you really wanna do that to yourselves.
Music is "On the Nature of Daylight", originally by Max Richter, but an arrangement by me