I am currently playing! Though I am waiting for my seedling so there isn't much to do. Which is something that could be improved? I am kinda just sitting here. Or maybe I'm playing the game wrong! haha.
As for your questions for feedback:
I think the premise of make better plants over time and the explanations are okay. I don't understand the fruit mechanic yet nor why things like explosions are needed but maybe I'm not far enough along? I'm not sure.
I do like the concept yes. It's an odd (In a good way : ] ) thing that caught my attention and I'm interested where you could take it!
As for gameplay, I think the drag and drop is fine. Though I did just try on clicking for about half a minute before I figured that out. Again my thing is that there isn't much to do at first except wait for your seedling to grow up.
Two last things that I got. The interface of the side might be able to be improved? Like grouping the generators into one bug group with individual information being a drop down? As it is I get a bit lost and I couldn't imagine all the things that would be there for a huge plant. And lastly is the upgrade mechanic. It doesn't have any response to upgrading and I was confused if it even went through.
This seems like a lot but I'm just trying to give an honest reply and answer your questions. I do think your game is cool so far though! Hope this comment helps.
Edit: I just noticed it's an idle game... Oops. I guess I was playing it wrong.