Glad to see you made your goal! Really impressive what you cant do with your engine and your RPG sounds fun as well. I went ahead and backed you hoping that you do indeed port to Linux =D
Initially avoiding ports but its pretty trivial - all cross platform libraries at the moment and this was originally built on a mac and ported to windows. Once I get game semi functional, I will integrate porting (if someone else has not already done the job).
I would imagine that getting it running on *nix will get you access to a lot of the gamers that like to do serious mods (however I might be wrong about that).