"Endless Legend" is having a rendering issue with OSX 10.15 Catalina. If you put the game into full screen mode, it renders a black screen. Trying to cycle between the modes with command+F, will briefly render the game.

If you start the game up in window mode, it seems to work fine as long as you don't try to enter full screen. But playing in window mode isn't much fun.

I included a screen shot showing it working in window mode under Catalina, and that Steam is installing the 64-bit version:

Thank you for the information.