Interesting puzzles, interesting concept. There are some technical issues I am sure you are well aware off.
- The combat is okay but white text on a light gray background is not easy to read.
- I was surprised that I could not walk backwards but that is fair enough.
- The transitions are also a bit too slow for my liking. That is not a big deal and easy to solve/customize.
- After a while the "sun" wall textures are a bit hard on the eyes but this is of course very subjective.
- The FOV is a bit extreme to a point where it is really difficult to estimate distances. I guess you wanted to show the tile where the player is standing on, which is very helpful to see if you can strafe to either side. Instead of using this large FOV I suggest to look into "Lens shift" that you can enable in Unity's physical camera. I m using this in my game with a FOV of 60° without distortion.
- I also noticed some slowdowns in certain view directions, I have a hunch that you don't use static batching and/or occlusion culling, both will help your performance a lot if you mark static object/walls as "static".
TL'DR
There is potential in here, hope you don't abandon the project.