First true Sandboxing game

Isn't this awesome?! I'd love to make a proper game from something like this!
http://mimicry.monobanda.nl/teaser.html

Here's the official site:
http://mimicry.monobanda.nl/

http://www.youtube.com/watch?v=ALr7ewimA78&feature=player_embedded#at=169
Also a nice idea, similar to sandboxing...