Sorry about that! I realized too late that the game is really badly optimized once you hit higher levels and start getting chain reactions. Turning off Effects helps for some things.
I wonder how far you can push the DOM. It gets crazy with so many element updates after a while but there are probably many performance improvements that can be done.
I understand, it would be nice if it periodically wrote out the score/etc to localStorage or similar. I got reset to the level I was on but I was up to ~$2K gold if I had gone to the next level that was reset. Far from the end of the world.
