Cool experience. I like that the tree sort of grows by itself and you just kind of shape it along the way. I had a bit of trouble making it do the exact things I wanted though. E.g. sometimes the branches don't go in the direction I placed them at. On the other side, I was disappointed that the leaves were just static things rather than tiny buds that grew into leaves.
Also, I would have liked something like a pruning mechanic as well, so you can really shape the tree into what you want it to be.
But anyway, nicely done. A very relaxing and cool game.