https://screenrec.com/share/oZ0aVj2wHh
This was the kind of game I immediately thought of when I saw the theme, "Built to Scale". It feels good to know that I wasn't alone.
The gameplay was simple, but fun. I liked the piggy-bank model. It fits well with the theme of scale, too. There is a glitch where Piet doesn't always eat the crystals, going over them without collecting them. I would definitely recommend fixing that if you get a chance. Also, the zoom could have been changed--one click on my wheel sent it to almost twice its size. Finally, it would be cool to see even larger crystals that I could eat/have a clear objective for the game. Fix these, and Piet could be even more fun!
Nice thumbnail, btw :)