Solid game! Honestly my two big complaints is the player look script, and the key's collider. The look script made me feel a bit sick. The key's collider seems to be a mesh collider which meant if I wasn't looking at the center of it while it spun I wouldn't have been able to click it for the most part. Easy fix make it a child object of a sphere collider so the player can always select it.
Cool concept, also is the maze randomly generated? That would be super cool. I also like the games simple objective and not including a jump mechanic was a really smart move.