Hi Cairn4
Firstly what a great game u've created, its my favourite genre of game...! cant wait to play it!
OK so my mac is running Intel 4000HD on i5 core! which i assumed would easily handle the game! as i play all sorts of games (civ5/6) that really push this Mac to its limits! (Fans kicking right off) but it copes! Ive tried to run the OSX version but despite various tries and ways around its still being unresponsive! I have saved a crash report which means nothing to me but it might be more help to you? i can send it in an email!
Cheers dude
P.s ive tried running this game through WINE and still nothing which tell me its my MAC! but who knows!