Hi,
The game seems to force the fullscreen mode. It does not seem to work : the screen is black.
If you ALT-TAB to finder the game is stuck below the menu in the upper left corner ... See screen capture. I was unable to play in a Native Mac window.
There is a way to make fullscreen mode work ; you need to be very fast 😕
1 - first, go to default fullscreen with ALT TAB ; the screen become black.
2 - ALT TAB to finder. PAY attention. This is at this point you will be able to go fullscreen. The finder should play an animation : the greyed window seems to come from the dock and "fly" to the upper left corner.
3 - DURING this animation ALT TAB again once ! If you do it at the right time you should go to fullscreen. This time the game will show correctly.