In order for you to play Moon Hunters on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
OS X Lion 10.8.5
Processor (CPU):
Dual Core CPU
Memory (RAM):
4 GB RAM
Graphics Card:
OpenGL 3.0 compliant with 1Gb of video RAM. 1024 x 768 or larger resolution
Storage:
4 GB available space