In order for you to play Fly O'Clock on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OSX 10
Processor (CPU):
Intel Dual Core
Memory (RAM):
2 GB RAM
Graphics Card:
nVidia 320M or higher, or Radeon 7000 or higher, or Intel HD 3000 or higher
Storage:
200 MB available space