A weird, slightly obscure game based around anthro bunnies punching and kicking things. Its combat is very unique, but its clearly a demo. Overgrowth is its sequel, but given how that game is, you might as well just play Lugaru since it's free.
One of the my favorite games of all time and it has absolutely no right to be among them. I have no intention of ever finishing this game, but I do intend to treasure my memories of it.