That was close. There is about a tenth of all I wanted to put at the beginning.

But it's here, and (IMHO) it is playable. Well, at least for 5 minutes.

https://ldjam.com/events/ludum-dare/47/loops-in-pool

My Squarity engine need lots of improvements, starting with correct log when the python code of your game raises an exception. Nobody wants to debug only with prints.