Entered full screen mode on my Mac and now all the game displays are blank screens and I can't seem to minimize it now.

Hi Justin, there are indeed some issues with Blockara on Macs. There is an approximate compatibility table in the System Requirements section on the game page; but during development we didn't have access to many Macs to iron out all the bugs. Sorry about that; hope you don't mind playing in windowed mode, and I hope you enjoy the game! Thank you for giving it a chance! :)