In order for you to play Oxenfree on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 14.10 or similar
Processor (CPU):
Intel i3 2.0 GHz
Memory (RAM):
2 GB RAM
Graphics Card:
1GB Shader Model 3.0 Compatible (DirectX 9.0c)
Storage:
3 GB available space
Sound Card:
DirectX 9.0 Compatible
In order to play Oxenfree on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
Ubuntu 16.04
Processor (CPU):
Intel i5 2.5 GHz
Memory (RAM):
4 GB RAM
Graphics Card:
NVIDIA GeForce GTX 460 / Radeon HD 6750 (or higher)
Network:
Broadband Internet connection
Storage:
3 GB available space
Sound Card:
DirectX 9.0 Compatible