Really cool tower defense game!
I like the concept being a hivemind plant taking over, that's really cool, and expanding your base with roots is a neat way to re contextualize getting tiles.
It might be a plant already and I just missed it, but it would be nice if there was a plant similar to the Sunflower in PvZ that generates points for you. (I know there's the Biomass extender but I believe that just gives you more tiles?)
Otherwise, really fun and hope you guys will have time to flesh it out more!