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Ooof, I didn't realise Gamemaker can't export mac builds. If you do decide to port it, godspeed! In meantime I'll track down a PC :)

Old Game Maker versions can't, but GM: Studio can, however, you need a Mac computer, too.

Yep, exactly. I would like to port Cthon to Studio down the road, but there's a lot of stuff that will break that will need to be fixed, so it will be a fairly major project.