Leaving assets and design aside, the Idea of the game is nice. You as an outstanding factor being able to manipulate the outcome, sounds like a neat idea. But there are some points missing.

A score would be nice, to compare your different runs.
Balancing seems a bit rough as well.
Visual Feedback for how big your heals are and what entities you healed would also be nice.

I like the idea a lot. It's simple yet original. 

Being in-between 3 clans and trying to heal and push them away from each other is fun:)

I've played a few rounds and can say that the idea can definitely scale if given enough time