Thanks a lot for the detailed feedback! I'm really glad you found the shader interactions interesting. That was exactly the idea behind them — the player is supposed to observe and experiment with these special walls. Some of them become passable automatically, which is hinted by the shader itself, while others require multiple interactions to gradually dissolve and eventually become penetrable.
And you're absolutely right about the camera — that's the biggest issue. I rushed the process a bit and ended up mixing some of my own reusable scripts for both first-person and third-person control, which resulted in a slightly messy setup.