Personally I’ve always considered the multicellular stage to be very similar to the microbe stage but with the focus of the colony, which also introduces players to working with different cell types which the macroscopic stages will expand upon. Also with what Deus mentioned regarding the central cell, we could incentivize protecting one’s central cell by having it be the only cell that can create new cells for the colony. That way one could try and survive after losing that cell, but would be unable to enter the editor. Plus tutorial wise the introduction of cell differentiation should likely happen after the player has already played through the multicellular stage for one generation (This would also be a good way to mention the importance of the central cell.)