all you gotta do to open it when It says, cant scan for malware becouse its unknown developer, or some shid like that, just go into finder and open the application by right clicking it and clicking open from the drop bar, then you'll get a pop up saying something a long the lines of, are you sure you want to open *insert file name here*,  just click yes/open (I cant entirely remember what it says) then the game will open

also just so you all aware, Mac gives this pop up message for pretty much every game on itch, becouse its a unknown developer or some shid, it doesn't nessacarely mean there's malware or viruses