I'm using macOS Catalina 10.15.4. I download the file (it already comes in .app) but when I try to open it, it says it can't be opened and doesn't give a reason why :(
I was having this issue, but the instructions in the StackExchange answer here fixed it, maybe that can help you :) (Or anyone else coming here in the future... or help the devs make a distributable file that doesn't have that problem... or whoever!)
Thanks for the tip, we might look into it if we find the time, for now we can't support macOS builds, as we doon't own a mac - but we still wanted to offer the option if it works for some people