Greenkeeper passes, but barely. The game hook is almost too long, about 3 seconds shy of being a 10-second pitch. Technically, it qualifies, but it's not in the spirit of what a game hook needs to be. From the website:
"Going over seven words is not a deal-breaker, but if you go over seven words and you are writing too much description, then it is no longer a Game Hook but a 10-Second Pitch, and you are disqualified."
Greenkeeper is right on the edge of that. Review the descriptions of what a game hook is from the website. Other ways of thinking of a game hook is that it would fit on a movie poster or make a good slogan.
Magic Garden Tycoon, It's a Jungle in Here, or Little Shop of Horrors meets Civilization might be good game hooks