It plays really weird without textures on the wall. Add a Texture or set the camera to orthographic. I guess that would make things simpler.
I agree that adding a texture to the walls would help indicate that the player is moving. On my first try I thought I got stuck on some geometry or something because it didn't look like I was moving.
Thanks for taking a look at my game. I totally agree about the lack of textures. I've updated the project to have a simple grid pattern on the floors and walls to make them easier to see and to create a better sense of movement. Thanks for the comments!