@littlegamer after rolling each round you can choose to use the dice you have saved, but they are stuck in your workspace unless you decide to use them. I found that was generally my strategy too, using the workspace at then end for a couple extra rolls with less dice.
Thanks for sharing your playthrough! Score looks like 48 to me. - 18 points for strings of reagents (1x1 point, 4x3 points, 1x5 points) - 10 points for inside star is same - 10 for star points are different - 10 for scoring the heart item in the star (5*2)
I would have liked a little more time to make scoring clearer, but such is life!