I love this concept, and the gameplay is nice and responsive. The turning is quite ambiguous as to which side you move, so it takes a bit of playing around with to understand that you move to the right. I think making the turn animation a little slower and adding different colours to the blocks will make this easier to convey. As a first person game, it can be difficult to judge when to turn, as you don't know quite when you've gone past the block to the right of you.