Back in November '09 we gave a live demo of the Guerrilla Gardening: Seeds of Revolution prototype at the awesome Gamercamp v1.0 event in Toronto.
It has a general introduction to the game followed by a demo level with lots of new plants.
You can always read more about the game on our development blog: http://guerrillagardening.wordpress.com/
Thanks to the folks at Gamercamp for letting us host a copy of the talk. For this and other talks by independent game creators check out http://gamercamp.ca