Distinctive art, which is a plus.
Controls are terrible. Locomotion is really slow, strafing and walking is faster than just walking, because the two axis are applied at the same time so the input isn't 1f, but Mathf.Sqrt(2f).
Mario coins make no sense.
I saw the wrong instructions telling you where to go as false a mile away and ended up in an inevitable dead end, after walking very very slowly. Not what I would call fun.
Sound fit the atmosphere pretty well.