It's thursday and I'm still on basic simulation.  This is gonna be a serious DNF.

My pressure system is great at filling new spaces appropriately.  It's just terrible about emptying the spaces that flowed into them.

I've tried a "debt" based model that ends up running away to flood the world, and a "doom counter" approach that ends up static and unmoving.  A number of hybrids that behave very boringly.

I've got one last thing I'm going to try before I stop programming for the week and switch to just playing games instead.