This is the second tunnel game I've made in a series.
Music is by Eric Matyas http://soundimage.org/
I used Oculus Medium to sculpt an object to walk around.
I used Meshlab to reduce the polygons and add a textureless UVmap. Here is a tutorial on how to mostly do that:
https://youtu.be/lDiTvu0LKtc
Then I started experimenting with Unity 5's lighting-system. This tutorial was very useful (particularly the part about using a gradient):
https://www.youtube.com/watch?v=eGu9_8HS2uI
I used some image-effects which is a lot more obvious on higher-end machines. I haven't rewatched it, but I think this is the video that showed me how to use those:
https://unity3d.com/learn/tutorials/topics/graphics/image-effects-overview

I'm happy with it. Some of the scenes are much less optimized than others because I was learning as I went along. The various scenes can be summoned by top number keys 0-6. scene 5 and scene 6 are the least performative largely because I was just throwing stuff in and taking it out later. One of the reasons I enjoyed this project and that I am happy it is over is that I feel that I could now do a lot of this stuff with better optimization if I start from scratch (based on things I learned along the way).