Hmm, seems like a decent concept, but at the moment it just didn't seem to have much to it.
Usually with these types of games it can be really fun to see how the little guys grow and evolve as it can change their behavior pattern so that they have all sorts of fun dynamic interactions and such on their own accord that are fun to watch, similar to a fish tank or a game of the Sims or Spore or whatever.
Unfortunately here, the little guys just seem like boring shells with no personality or autonomy: they just exist for you to directly make them breed or feed instead of it happening organically. Because of all of the guys being boring shells with no personality, I felt no reason to want to breed or grow them into evolved forms since it was purely cosmetic: what's the point?
Not only that, but the controls were frustrating as well: was never sure in what way or how long I needed to shake to get them randy, and a lot of times my shakes would end up chucking them into the wall for insta-death.
Again, I think it could be a good idea and it floats some interesting ideas around like how you have to sacrifice units to feed others, but in the end it just felt repetitive to grind out all the different forms and it just hurt my arm from all the shaking.