So personally I would wait until it's finished unless you can't resist it now. Have a look at it and see what one person can achieve in two years, and I would argue that his game is at last as complex as this. Now before you say that it's only two devs, I would like to refer you to Limit Theory. All they have to do is create the actual maps.

I know the Dev's are working on going into Beta (though they could have gone into Betaat least a year ago with pretty much the same content) and the campaign, but come on, a campaign doesn't take that long, they already have a (simplistic/quick and easy to use) scene maker for the characters so they don't even have to make cinematics and they have an in-game editor to easily populate the levels. It might also be just me but the recent updates don't seem to have as much in them compared to the monthly ones, which is kinda worrying. The updates used to be weekly, then monthly and now there are only a handful a year.

I love this game but check out the frequency of the updates this past year and a half or so, there practically are none, and back two or so years ago you will see the frequency of them decrerasing steadily.

On the upside though the dev's like to use their time (which by buying the game you have effectively paid/funded them to) arguing with randoms about their stance on Gamersgate. There is nothing to do in it except fight rabbits in an arena endlessly and the development seems to have slowed to a crawl.

Overgrowth game free