Thanks for playing, and for the feedback! I'm actually glad to hear that it's difficult. For a while it was definitely too easy.
The graphics question is interesting. It is Godot. This is my first attempt at exporting a 3D game, and I wasn't sure how the web version would work. The volumetric fog appears to have completely disappeared, which is a little annoying. Hope to play around with it more after the review period. Glad you like the lighting!