gave the demo a go, it was pretty fun! it felt a bit like the opening parts of Daikatana, except good. it also reminded me a bit of Unreal and Chasm: The Rift.
I enjoyed the visual style, it felt like Unreal mixed with Half-Life. The classic painted texture look never gets old to me :)
I got lost navigating the level, maybe an automap would help out with that?
I did run into some technical issues. I have a high refresh rate monitor and the game seems to be capped at 60-ish FPS, which unfortunately looks a bit choppy.
An aesthetic issue I have is that I don't like texture filtering, and there didn't seem to be a way to disable it.
Props on creating your own engine. It's rad!
looking forward to seeing what happens in the future!