Reminds me of Continuum:
<a href="http://www.getcontinuum.com/" rel="nofollow">http://www.getcontinuum.com/</a><p>Although that's a thick client and was a pain to get running on Linux through Wine last time I tried.
Awesome game Rob, but, related to the comments about the twitter login, next time it would probably be a better idea to use a different login system even if it's just a proof of concept.