I'm not sure what kind of graphical representation is best suited for difference. Maybe red/green circle-like shape of which radius indicates the difference. Smaller circle means smaller difference. Red and green indicates negative and positive difference.
Two options: compare to previous or best. Implementation of detecting the "best" requires some further discussion.
More simpler implementation is to display dots from previous session.
I'm not sure what kind of graphical representation is best suited for difference. Maybe red/green circle-like shape of which radius indicates the difference. Smaller circle means smaller difference. Red and green indicates negative and positive difference.
Two options: compare to previous or best. Implementation of detecting the "best" requires some further discussion.
More simpler implementation is to display dots from previous session.