In order for you to play Valley on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
Mavericks or better
Processor (CPU):
2.7 GHZ dual core or better
Memory (RAM):
8 GB RAM
Storage:
5 GB available space
In order to play Valley on macOS with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Mavericks or better
Processor (CPU):
2.9 GHZ quad core or better
Memory (RAM):
16 GB RAM
Storage:
5 GB available space