Hi there,
Thank you for the playing and your feedback.
Sorry I don't know anything about Linux but I think is the black screen is caused by DirectX(DX).
I put video in the game and it is using the DX12 when I developed in Unity 3D, so any other version that lower then 12 is not working. I will try to change the setting of DX in the new version of the game.
And yes, we'd like to make the English version of the game, but it takes more time than our thoughts.
For now we're focusing on the Chapter 2 developing.
Thank you again for paying.