Novel and interesting concept.  

The game works fine, but it takes so long.  The physics needs tuning.  It's also quite tricky without a guide showing you where you'll strike the balls.  Trying to use portals to make shots is even tougher.  

Could also do with some music.

I think some sort of crosshair or guide that shows you where your shot is going to go might help the portals be more relevant in this game- that way you can actually see if going into a portal is strategically beneficial or not. As others have said also the wait times are long, either increase the traction on the table surface or force all balls to stop moving once a certain velocity threshold has been reached

• Main issue is that low-velocity friction isn't high enough, so you usually have to wait >30 seconds for the next shot even after the balls have essentially stopped moving
• Main idea could be expanded greatly, the tiny set portals don't change the game that much and you can't really see through them effectively to line up shots
• Would love audio & visual feedback after sinking a ball into a pocket, and/or something keeping track of score
• If you hit the balls hard enough they go over the side and don't respawn or anything if I understand correctly
• Rotating the camera more freely or at least a little faster would be nice

I didn't like the concept that much until I accidentally went through the portal and scored two in one shot. Would play even more if I didn't have to wait 10 more seconds between every shot.

Cool idea, it just needs more flashing out and a scoring system. Also the time to wait for the ball to completely stop so that I can shoot again is too long.