What are the walls? Are they the words of people in the memory of SGDS? Are they the imaginated conscience? The final command from a corrupted government?
After playing this game, I know cells so well that I'll ace my biology exams, become a doctor, and then I'll diagnose patients with things like, "You need to upgrade your membrane" or "Buy some more lysosomes!"
Is there a way to re-do a save point so that you can load at an ealier point in the level instead of going all the way back through the level after a death?