Thank you so much for playing and your Suggestion!
We actually had the idea to add a feature that allows the player to plant extra roots between the others manually. These extra roots could've than be used to change the moving direction of enemies, to reach special locations like lakes ( also not yet implemented, but they should give the main tree some specialabilities) and also to build towers on them more dense in the far distance of the main tree.
But yeah, more towers are already im the making :P
Have a great one!