Sadly, yes. I downloaded the game from GoFile and I only saw ARTEMIS.exe and ARTEMIS.py. Maybe it's the hosting, I'll check it with a different one. Do you remember where you download the game from.
Only Win and Mac were released. If there isn't a Linux version available then you can just use the Renpy SDK.
1) Download the
You must be registered to see the links
.
2) Download either the win or mac version of Artemis (doesn't matter which one. both will work)
3) Extract the Artemis folder into your Renpy SDK folder
4) Run renpy.sh from the SDK folder
At this point you have two choices. Either just use the SDK as a launcher to start Artemis, or use the
Build Distributions option to build your own linux version. Both options work and your save backups are still in ~/.renpy as usual.
This should work in most cases regardless of whether you're on Windows, Mac, or Linux if the game you want isn't available for your platform.