The overall feel of this game is simply amazing. It's enjoyable and offers an interesting challenge. It shows that there's strength in numbers, and needs strategy to surpass the levels. It also shows an infinite potential for your army, as in the beginning it's rather small and weak but in time as you defeat more foes your army gets more powerful and becomes unstoppable.
Only flaws I could see is that when there's multiple enemies attacking at once, i'd like some of my blobs to evolve but they seem distracted by trying to kill the enemies. Same with the flowers.
I would like to see a bar added so you can see when your Orb is under attack at all times. Also to fix the Distraction problem you could add an option to set their priorities. To say if their priority is to evolve they will evolve as fast as they can then if they can't they'll move onto killing. The way it's set now would be the priority for killing.
Overall, Excellent Job!