Browser version is basically unplayable. However, I liked the downloadable version a lot. It's an interesting take on pool, you really make use of those 3-dimensions. It made me realize that it's a little funny how there are many "3D Pool" games but none of them actually make use of another dimension. Theming is nice and very calming. This is unironically one of the most engaging versions of 8-ball I've played.
Some bugs and fiddly things I found:
When the player gets close to the ground, it can be very difficult to see where you're trying to shoot, it'd be nice if the ball was rendered over the ground or if the ground lost alpha when it intersected the camera. The pool cue trident sometimes would spin wildly out of control as I pulled it back and sometimes not even hit the ball. I assume it's because it has a rigidbody that is not constrained? Sometimes you want to aim straight upwards but the camera does not allow you to do so.
Where could you go from here:
I think it'd be cool if the pockets had some depth and waited until after the end of the players turn to remove the balls, it doesn't feel very good to have them pop out of existence when they get close to a hole. I think it'd be cool if the number remaining balls for the enemy player was also displayed on screen. It'd help build some tension. I think that an options menu with at least options for music/sound effects would be nice. I also think that adding the ability for the player to hold shift to slow camera speed/power selection would be a nice QOL feature.
Overall, you did a good job and made something innovative and fun to play. You should be proud.