Alright. I've uploaded a naked .swf that allows you to plant trees and then either overgrow (to produce MP) or enshrine (to defend what you have). You may only plant new trees next to mature pre-existing trees. If you can somehow manage to plant the forest throughout the town, the trees will knock down the houses. PLAY HUNGRY FOREST, KIND OF.
I doubt the game is "winnable" at this point, since the lumberjacks are designed to be just a WEE bit stronger than the trees. Still, if you can manage to destroy all the houses and kill all the lumberjacks, the game acknowledge that you won. If all your trees get chopped down, you lose.
Lots of work still to be done (music! sound! animals and fungi! torches and hunters! sardonic victory and defeat screens!), but I feel good about this start. I've never attempted anything of this scale before; hooray pageants.