The OpenGL version is mainly for Linux and Mac, but no harm in trying a PC build. Drop me an email if you're interested and I'll discusss it with you further. My email address can be found here... BitGlint Games
Just a note, in case anyone experiences slow down drawing, I just tested an OPEN GL version for windows and everything is rocking perfectly!
The game is super fast and furious, the kind I like, will savour it properly in a few days and come back with feedback.
Ace work! Kudos for Rich and his dedication to the project :)