This would be a b*tch to play with friends :D
You already know about the hole border, but maybe also make the gravity more aggressive? The ball is kinda floating when in the air. Also waiting for the ball to calm down after a shot is taken just takes too long. But what you got here is really nice, you just need to fix a few things here and there, replace the skybox, add some post processing and boom. Keep it up! :)