So my quick and probably wrong math says there's an optimal point at which to sell a stack of icecreams - the day adding ice would cost more than the resulting scoop of ice cream would be worth. That goes a bit against the idea of building a stack as high as you can, I think.
Also I've somehow managed to create a tile with -1 ice on it, which won't let me add ice to it, so it just consumes any ice cream planted in that tile.
But other than those issues, its a pretty good prototype, especially for a last minute pivot - and maybe its the music, but it does a good job of generating a chill atmosphere :]