I even turned down a request from the Puzzle Pirates guys to include it as a minigame in their game (that was a mistake), and OmgPop almost paid me to make a version for their website (shortly before they made Draw Something and got bought by Zynga), but I was too busy trying to finish my degree at the time.
I've been tempted to start an open source version to get some help developing it, but I started getting more into board game design lately and I've been programming less and less in my spare time. Kinda hoping I get a reputation in the board game world and then get a board game version of Proximity published (it's an abstract, so it's a harder sell to publishers).
Anyway, I'm glad you enjoyed the game. Hopefully someday I'll put out a newer version of it.