This was fun and it looked genuine 90s. The gameshow aspect worked, too because as I was taking a full cart to the checkout I was mentally-screaming "Come on, Dottie! Hurry up!" If you expanded it, A.I. opponents would neat, random items around the store, upgradable carts, or have other stores, bigger stores as other levels, or a puzzle-variant of the game where you need to bring back specific items. Also, like mentioned below, an announcer would be great. Could be really funny, with comments throughout like a Outlaw Golf/Volleyball kind of commentator.
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Thank you for playing, I'm very happy to hear you liked the theme, and even happier to hear you played as Dotty! Those are all really great ideas; an opponent or two and even some set-dressing NPCs would add a lot to the atmosphere, and I like the idea of random items and cart upgrades too. Puzzles or level specific events would be a great addition, and could probably be hooked into the challenge system currently in place. I can't promise all of this will make it into the next update, but at the very least, some new levels are on the way!