I love that you have a README and License file (main criteria for open source category). Your README is really great - lots of information, good gifs, and graphics.
Rather in depth game, nice job. Loving the in-game graphics and gameplay. Sound effects are awesome. The chill vibes music perfectly fits. I love that you can completely lose balance on the tray and all the food just slides off. I couldn't find where the customers were to deliver the food, but I had a tonne of fun playing around with the physics. It does feel like the orders come through super quick though. Great job on your game and very fun to play.