I had a very similar idea this summer. But my kids are 6 and 8, so I approached it using the video game approach. It's been an absolute smash hit and entirely altered the habits of doing chores in this home. It's been about 3 months and it's still going stronger than ever. The whole thing is a static page, driven by a Google Spreadsheet that Mom and I edit to adjust goals and track progress.
https://ibb.co/RTw5sCDJ https://ibb.co/ycRB8750 https://ibb.co/gLGQ0tKT