In order for you to play Planet Coaster on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
10.14 (Mojave) or later
Processor (CPU):
Intel Core i5 (4 cores)
Memory (RAM):
6 GB RAM
Graphics Card:
Video Card (AMD): Radeon R9 M290 | Video Card (NVIDIA): GeForce GTX 775M
Storage:
15 GB available space