Oh no! It actually should work, we haven't experienced any problems with the OSX build so far. Could you specify the problem and when you experience it precisely? Sometimes the download gets mangled though. I suggest attempting downloading again, maybe even trying the (equally free) Steam version.
Viewing post in Bug reports? Polish suggestions? comments
Damn, I think the OS is too blame here, this version won't run on your OS. Since this is freeware, we don't have the budget to maintain it and make the appropriate upgrades, which would be extensive. I can only recommend running it on an emulator, there seems to be no other solution for now. My sincere apologies ...