In order to play OPUS: Echo of Starsong on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
macOS 10.13.6+
Processor (CPU):
Intel Core i7 2.6GHz 6 Core
Memory (RAM):
8 GB RAM
Graphics Card:
Radeon Pro 560X 4GB GDDR5
Storage:
4 GB available space