In order for you to play Hammerfight on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
Mac OS X 10.5 or later
Processor (CPU):
Intel (32 or 64 bit)
Memory (RAM):
256 Mb
Graphics Card:
Any GPU supported by Mac OS X
Hard Drive:
150 Mb
Sound:
Any hardware supported by Mac OS X