I love that you have a README (fill it out with some information - such as what's on your submission page: https://unique-chars.itch.io/balance), and have a License file (main criteria for open source category).
Add a menu and controls (once you lose) so that it goes back to the start of the game or similar. I had to refresh the game and re-run the game from there. Interesting concept, I enjoyed the way you put this together. Good take on the theme and rather creative; maybe make the "balance" scale more obvious so you can tell it's scales. The physics is a little off on the car collisions, but nice job either way. Add some sound effects and music to make this super immersive.