Don't know if this is a bug exactly, but when I run the demo my MacBook Pro quickly gets very hot - enough so the fan starts blowing hard - and I can see in Activity Monitor the game is using a huge amount of power even when there's nothing moving on screen. I rarely have this happen with any other app. This game doesn't seem to be that graphics intensive (no 3D or texturing), so is this the overhead of the Unity Engine we just have to live with? I'm on a 2016 MacBook Pro with 8 GB of RAM running macOS Catalina.
The heating issue is a bit uncomfortable, but won't stop me from playing the game. Very excited for the "full release". ;-)