Here's the Game Over screen where I've just died on level 8.
The orange blobby bit of the graph represents the game I've just played. The green bit of the graph is my own best level scores (which are used as start bonuses, as perviously explained). The middle yellowish trace is what the game considers to be a "good" score. So as you can see the game I just played wasn't that good, but i have start bonuses set that are really rather excellent, way above the "good" line.
The graph is live - you can use the sticks to zoom it and move the cursor. Here I've moved the cursor down to see how i was doing at level 4 and the stats are displayed.
And here I've scrolled right out to level 70. You can see the profile of my best level scores - I could use some work on that big chunk in the middle where they are all below the "Good" threshold, but they pick up fairly well towards the end there.
Just a nice little feature that'll let you check your performance against your own best scores per level and against what the game "thinks" is a good score }:-).