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It's a play on the shape of the word itself.

"loop" spelled backwards is "pool".
So I made the pool game itself played backwards to flip it around again. 

Bit of a stretch, but it made me chuckle to myself, :P

Totally hear ya on the music! Straight ran out of time to look for sounds at all, but I do agree it needs some jazzy tunes and some billiards clacking around for sure.

The simulations definitely get pretty absurd with anything past 3 balls. More puzzles would have to introduce more static elements (think bar glasses on the table, stuff like that) to make more predictable paths with fewer moving elements.