I'm sorry to tell you, but I really doubt that you can fit so many positions in just 84 pixels. Movement is far too smooth to be snapping on a grid, so I would definitely say this is not entirely 84x48. I'm not saying the art isn't applying to the rules. What I'm saying is that the player shouldn't be allowed to be in between two pixels (and trust me it's a nightmare to get it working in unity).
Other than that, it's a great game! Keep up the good work!