This is good feedback.
With the current max sizes it's related to the size of the PNG images themselves. It's not really a limitation, but more that I chose that width so that it won't cover up anything on screen. You can change the overload image to show the entire width of it and goes to, like, half way across the screen. I might change the option to show the full overload image to also show the full expansion sizes.
Eventually, I'll make Cowza change to the same growth type the player chooses. And I do plan to make her grow at some point, it's just lower priority.
Hmm, maybe I should make a scene for Cowza doing something.