Excellent update!
Notably, the game can be put in a very difficult to stop loop if you have a persistent gold slime, and a persistent honeycomb jelly. The resultant infinite gold rain will continue even if the opponent is defeated and interestingly enough, can even carry over into a new playthrough if you exit to menu during it.
I'm not entirely sure why your board doesn't overflow during this since normally gold would cause an overflow, perhaps it's simply the number of collisions at once?
Aside from that specific occurrence I ran into no issues.