Story - While there wasn't much of a story here, I did enjoy the little proverbs that popped up. I really wish I could have written a few to send off! Or at least be given a list of proverbs to choose which ones to cast out into the world!
Mechanics - Pretty simple shape matching, but it works!
Theme - I think the theme would have been even more spot on if players were given the option to GIVE UP some shapes to others, casting them out to those in need. Right now it felt like there was a lot of receiving, but I didn't feel as though I was being all that generous with my plant building.
Audio/Visual - Very nice, zen music. The visuals were simple, but they worked.
Overall - A really nice, pleasant experience. Great job!