I mean currently you can fluidly walk between the grid tiles and stop anywhere you like. What I prefer (and it's mostly personal preference) is that one press in a direction will move you all the way to the next tile.
An alternative I'd also be cool with would be to just make it possible to walk diagonally or walk over the corners :).
And yea, I figured out that's the reason for the first levels being simple, but being a kind of a hardcore gamer myself I usually like to skip the fluff and go right away into the action.