L U C A H is planned for release on Windows, macOS, and Linux. Since the game is developed in Unity, refer to the system requirements for running a Unity game:
OS: Windows XP SP2+, Mac OS X 10.8+, Ubuntu 12.04+, SteamOS+.
Graphics card: DX9 (shader model 3.0) or DX11 with feature level 9.3 capabilities.
CPU: SSE2 instruction set support.
(These specs are taken from https://unity3d.com/unity/system-requirements)