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This game is a lot of fun with some friends!

Would you think of possibly making the source code public? I'd love to have a crack at porting this to Mac! 

you can find the source code here 

ps, tell me if you get it onto mac!

There are a few hundred hours worth of changes between the original Spelunky Classic source code and what Spelunky SD is. Perhaps a few dozen less if you take the Humble Bundle version that’s already imported to GM:S.