This piece is fun - it's an exercise in awareness, and a challenge to dexterity.
Read bars 1-2, then examine bars 3-4. Barely a change, right? Each bar introduces a new, very slight change, that will mess with your muscle memory.
Play bars 1-2 until you know them by heart, and look at bars 3-4 while you continue to play 1-2. Do you make a mistake?
Try to picture playing bars 3-4 while playing bars 1-2. What do you observe?
Here's a link to a pdf of the piece
And a slow walk through the piece: