Interesting idea! I love growing tree mechanics and thought it was interesting to have the two upgrade trees seem to tie together.
I did find it a little annoying that basically I played with the upgrade trees open, blocking the view of the main tree. When I closed it I didn’t see anything I could do, so I felt it made more sense to just have that window open. I also think it would have been nice to visually see a difference. I was confused by the leaves falling. Thought maybe I could interact with them but clicking didn’t seem to do anything. What were the additional arm things coming out of the trunk?
I maybe hit a bug about halfway through the two trees where it seemed like I wasn’t generating energy anymore. Then the progress bar would fill up all the way, then pause. Is there something I missed with balancing the different resources that gets it stuck?