Hey!
Sorry for the delay of my answer. I tested a bit more and I found out that the movement is not as problematic when VSync is turned on. If it is turned off (which I did) on the other hand I move a square or sometimes more, to far. I played with the cell highlight off. :) I still think it might need a rework but after replaying with vsync turned on it was a fully enjoyable experience.
Best Regards!