This game is begging for medals
Great game. Curse you for keeping me up until 5 in the morning! ;)
Anyway, I think there are some medals that could live in this game:
Get all levels gold (or fully upgrade everything; they're synonymous, basically)
Destroy 25,000 polygons
Create a reaction that takes more than 2 minutes to finish
Finish the game without reassigning you upgrade points
Finish easy without buying any upgrades
Finish the game in under 3 hours
Bronze the final level in 3 clicks or less
Have exactly 1 of each shape on screen with no reactions going off
Great game, I'm looking forward to your next.