Super fun game! I love the physics of the game where everything is just flying around, it adds a lot to the comedic value of it all. The player has to balance speed with accuracy in a beautifully designed risk vs reward set up.
If you wanted to keep building, additional levels with different layouts could be fun along with additional challenges such as wet floors. Maybe a game mode where you specifically have to get an item like toilet paper and nothing else will go into the cart. Making this a multiplayer experience for like a party game could be fun. I could see this being popular on youtube if you add more variety and depth to it.
Overall, fun game! Best of luck on your future game dev!