I thought that multicellular stage was all about living as simple multicellular colony later evolving into other kinds of tissue allowing the formation of more complex organisms, not playing as an entire animal or plant. Playing as an animal-like creature would be in Aware stage, because that kind of organism is far more complex and has many kinds of tissue.
"the first multicellular organisms were simple, soft organisms lacking bone, shell or other hard body parts, […]
Symbiotic theory
This theory suggests that the first multicellular organisms occurred from symbiosis (cooperation) of different species of single-cell organisms, each with different roles. Over time these organisms would become so dependent on each other they would not be able to survive independently, eventually leading to the incorporation of their genomes into one multicellular organism.[31] Each respective organism would become a separate lineage of differentiated cells within the newly created species."
There’s other theories, but you can read them on your own, I put the link above.