This is cool! I'd read your comment about what happened behind the scenes. So much to consider and need balancing. Good job managing all that.
I'm not really familiar with desktop game, but I believe visual should be the main aspect of that kind of game, at least in your case. The satisfaction comes from watching how it blossoms from nothing to an incredible and lively terrarium. Visual improvement will definitely make the game so much better.
Overall, this is a nice and relaxing game. Love the music too.