Here is a cool playthrough of Thrive by SpikeViper, recommended just for the entertainment value!
One thing that happens is that he gets so big that his ATP never runs out, it sort of gets stuck at 5 and never goes below that no matter how many flagella he adds.
So if anyone is interested in doing a bit of QA / Bughunting for us can you find the conditions under which this happens? What should happen is when you have too many flagella and your ATP runs out you take damage.
Basically just make a few cells and try and make them run out of ATP and see what happens? What happens when they get really big, can they run out of ATP and take damage? How big did you have to get before you no longer took ATP damage? Did your ATP get stuck at some value?