In order for you to play Skilltree Saga on macOS with minimal graphics settings, your computer must meet the following requirements
Operating System:
Mac OSX 10.5 or higher
Processor (CPU):
Intel Core i5 2.4 GHz
Memory (RAM):
2 GB RAM
Graphics Card:
NVIDIA GeForce 300 Series or Radeon equivalent (512 MB VRAM)
Storage:
600 MB available space