Ok thanks, extracting the dmg to the app folder and using the command did the trick :)
Weird, as detailed in this article:
this security thing should appear only with zip downloaded on the net, (not from local network or usb file) but as I see it happens with the .dmg file too (I mean not zipped..well although dmg is a kind of compression too)
Anyway I'm glad to play it, it's really fun ( ˶ˆᗜˆ˵ )
great job
Edit : 72hours!! most people don't realize the amount of work it requires to do that in so little time (It nearly took me a year to make a playable demo TᴖT )
and found Bugs: on Mac at the start of stage 3 once grandma start talking after the player complains about turning too much left and use a drug to compense, the game crashes.
And a little other one but it helps me a lot: if you quit the game and choose continue, you'll start on the next stage