Thanks for checking it out :) It's nice to know it actually works on Linux as I never tested it there myself.
The map was made with the Unity terrain tools of the time. I started with a height map I made in Photoshop then refined it from there in engine.
And unfortunately, this is a long abandoned project. We had the intention of making the full game but both the programmer and myself moved on to other things before getting too far.
I'm glad you liked seeing the project none the less!