So, My first impressions were this:
Looks pretty cool. Hmm... Lots of instructions... Ok, playing game... crap, I don't remember most of the instructions. Restart game. Reread instructions. Get into game. Harvest the one tree on the island. Wait. Die.
Play again, harvest the one tree on the island. Wait. Die.
I then looked at comments here to find that you have to let a tree live so it will make more trees. After that, I played the game, let trees live, and had lots of fun, until the game restarted. I don't know why it restarted, maybe it's a bug, or maybe I pressed something, either way, I didn't mean to restart :(.
Anyway, I think the game would be awesome if there was an indication that trees will grow (did I miss it in the really long list of instructions?). Possibly have the trees grow right off the bat (because otherwise it's load the game, and immediately have to wait 15 seconds before you can do anything (at least with only 1 tree you can't do anything, because cut it down, and game over).
With some polish, I think it could be pretty good though!
Oh, also, with tons of turrets, it got really hard to see where I could place things because of the overlapping circles.