And deservedly so.
"This is a mazing TD without a builder. Instead, you sprout new towers off of existing towers, in an effort to create a maze to stop the enemy units from destroying your Tree of Life. There are 50 levels. Good luck!"
You Defend your base Tree which spawns tower seeds which once planted branch different towers using new available units leading; Usually to a long cycle of different units with unique attacks and skills etc. Has co-op or survivor and options for each of those modes as well.
I am not a master at this by any means but its unique play-style and expanse of unique and animated towers and upgrades keep me commin back for more!
I'd love to have someone check it out and maybe start hosting if anyone likes it!

Sprout TD 2.1 - Map Preview - Download Page