In order for you to play The First Tree on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
64-bit only (tested with Arch Linux 4.12+, Fedora 25, Ubuntu 16.04+, Mint 18, Tumbleweed 4.13)
Processor (CPU):
2.4GHz CPU Dual Core
Memory (RAM):
8 GB RAM
Graphics Card:
Dedicated GPU recommended with 1 GB video memory, may still work with Intel HD 520, Mesa 17.2+ and Nvidia 384+ tested
Storage:
4 GB available space