After getting a bit of feedback I've added a couple of small features.
-You can now change the zoom level (FOV) in-game using the left Shift and left Control keys.
-Added the ability to do a 'dummy' camera rotation. This allows you to get a good view of the puzzle you're in without causing any tile changes. You can do this by holding the right Control key while using A/D to rotate.
I also made a few improvements to how the tiles are generated. You should see slightly better performance.
There is an issue on some machines causing very low frame rates. There seems to be a Unity bug which I haven't found a workaround for yet. Working solo it's hard to find time, but I'll do my best to find a solution.