[uzidil]

Yes, the engine is written in go and uses opengl (the isometric layout uses the opengl z buffer). The game is written in bscript (https://github.com/uzudil/bscript). I've always been a huge Ultima fan and this was a lot of fun to work on.

[whitehexagon]

Cool. I spent some years with opengl and now webgl2, so I have a feel for how much work that entails, well done! I never quite got a satisfactory result with the z buffer, just a bit too much of a z gap on my geometry outlines to avoid z fighting.