Seems like a lot of depth and replay value in the puzzles offered (I only got to level 4 or 5). I found it relatively easy to understand, other than there being a lot to look at in the first screen. I liked the combination of player control with the billiards stuff. A couple of physics things felt a bit off - the other balls would knock my player back, but I didn't have any effect on them after they were moving? I was also getting the feeling that everything was sliding on ice, and would have liked the balls to have a little more friction at the really slow speeds.
I was impressed by all the optional objectives and tracking them, great job! Here's a playtest
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To help contextualize what you were feeling, in "walk" mode, the other balls "bully" you, but in "launch " mode you'd be able to knock them around evenly.
Also if you go back, you can press and hold "L" for 1 second to go into debug mode. The screen doesn’t look any different, but you can enter any level.