I just spent over 3 hours in one sitting...
The game is overall fun and I found the balancing pretty damn good. As soon as I realized that neurons took so many cells I started to find an equilibrium when I could produce millions in a single click before really diving head first into neuron production.
The only complaint I would have is that if I get high enough in cell count I would like that the sprite doesn't revert back to a previous evolution. I understand that it makes sense given there are less cells but the entire point is I want to look at the lewds for an extended period of time. But I suppose that is also what kept me playing for so long.