I just played through it and can vouch for its coolness. Especially the bonus zombie level. The quality and quantity of Lugaru mods always amazes us, especially given the lack of any real modding tools available for the game. Stuff like this is what has motivated us to work really hard on making really powerful mod tools for Overgrowth. In case you missed it, here's the Overgrowth map editor.
What's cool about it is that it has a JSON interface so anyone can grab that data and make their own mod browser. Joel Levin has already started work on a hot Cocoa, OS X mod browser that will manage your mods and auto-install them for you. Please contact us if you'd like to make a Windows or Linux counterpart.
More on this, App Engine, and ultimately the hot Overgrowth mod browser, later!