Terrific Game.
This is a literally awesome game, with legitimately good gameplay, in addition to being educational without pushing too hard.
I got showstopped on the level indigestion when the Golgi Body stopped producing toxins at 98% despite an abundance of all resources. This may have been due to my frantic queuing of Toxins as I tried to outlast the viruses by closing the gap.
Instead of acquiring organelles, why not have the nucleus build them, so that the bug could be creatively solved (allowing a player to replace a locked up organelle and recycle the old one just as if it had been damaged, rather than being a bug). Of course, that would leave the possibility of a nucleus locking up, and without an ability to divide it, unless the option to divide was located elsewhere.
Anyway, wonderful work on this game.