Hi, jojowear! Thank you for downloading and giving my game a chance!
This is a first though o.o the demo package should've included all 3 versions, mac included. Once you opened it, you only need to click on 'NusantaraBermuda' app (not the .exe one) and the game should run by itself. Maybe your mac automatically blocked it due to it being a new app? I'm not sure >_<; all I can say is; try use a computer (windows) or try with another laptop? Maybe your friend's? I'm sorry that I'm unable to give you more help Q_Q