This game has potential
This is indeed a good start. Besides what the others said you should add, I think there should be a way to differentiate the cells better, like making some of them squared, others triangular, others with a hole in the middle, others with spikes, etc. There should be some traits that are inherit from the parents and some others that are unique from the newborn cell; I know you aren't a biology student (neither I am) but like this you would be able to recognise who is whose son. And how about giving some bonuses for cells that survive longer? Like "the older the tougher"? And something similar to the newborn, like "the newer, the faster to reproduce? Obviously, first you should make some more characteristics than immunity and power. Try to steal some ideas from similar games, like phage wars, pandemic and the like. If you can, I think playing "Spore: creature creator" could give you a general idea. I'm not promoting anything, I'm just suggesting some materials from which copy...I mean... take inspiration for the author. Keep up the good work, I look forward to what this could become.