Regarding MacOS Catalina and the new app security, the fact that EA has mature content is not a problem. The notarisation process does not review the content, merely checks for malicious code through an automated system. The problem you do have is that in order to get the game notarised by Apple, you will need access to a Developer account, which costs $99 a year. Depending on how many people download for the Mac (I'm one of them) and correspondingly contribute to Patreon or wish to purchase the game when complete (also me), it might be worth considering making the investment.