This game is truly phenomenal, I absolutely adored the pixel art and music, they both worked SO well together to make a trully peaceful and charming experience. The idea itself was also very good and creative. The gameplay also felt really nice! Here's a bit of feedback:
1. The mouse button felt a little confusing at first, since I didn't know where I would actually click every time I clicked the mouse, if that makes sense. At first, I thought it would be in the center, so I was clicking on a tree I wanted to expand to and it wouldn't work, after some trial and error I figured out that the click was positioned at the tip of the mouse, and that made the experience much better.
2. Consider implementing a drag mode for the endless mode. Sometimes I just felt like dragging the leaves all across the map and spread leaves to my heart's content, but I couldn't really create that effect all the way without a way to drag the autumn vibes to all the trees (maybe I should have mushroom spammed more to be honest).
3. Lastly, the zoom felt a little delayed. Whenever I would zoom in, it would take a while for it to actually react to my input, so it felt a little slow compared to the other feedback I was receiving from the other buttons and actions.
Overall this was a really great experience, congrats on greating a fantastic game!