Great and novel in every aspect - even the name is pretty creative :)
My tiny suggestion - as per tutorial, I've been trying to shoot the cells on one side to accumulate the goo, but it doesn't really feel like it makes them die faster. I think a visual cue - like goo changing color or pulsating when accumulating on one side - would help, or just a plain hp. Maybe if I played longer I would get a feel for it, but it was not the case in the first minutes of the game.
Anyway, that's my only two coins, overall feels like a very polished game.