Well, giving +1 per adjacent still makes it impervious to most mass CC. That's the problem I felt with Swarm, since it'd need some counter. Maybe have them game +2 | +0 if there is adjacent Cell rather than giving them +1 from the card?
Well, on another note, how about having it make all creatures poisonous (e.g. coating your creatures with biofilm)? So it's not just restricted to your cells.
Also, when your creature slots are full, will it still absorb
?