Hi! I played a full week on desktop Chrome. I started in the itch embed, then opened the game on its own page because of the first point below.
In the itch embed I couldn't reach the price at all. The day screen is taller than the embed (the embed is 860px high, the day screen about 1480px) and scrolling is off in the embed, so "Recipe and price" sits under the Open stand bar. Even in fullscreen I couldn't scroll. Ticking "Enable scrollbars" in the embed options, or making the day screen shorter, should fix it. Maybe it's also part of what the first commenter ran into.
1. Honestly, I did exactly what you were worried about: I pressed "Match the forecast" every day and opened. I got 3 stars on Pricing without ever choosing a price myself. The line "Each cup costs $0.50 to make. Sell above that or you lose money." is very clear when you see it, but nothing made me stop and look at it. Maybe Match the forecast could fill the supplies only, and leave the price to the kid?
2. The report card is short and friendly, not preachy at all. "Posters and helpers are bets" is a great line for that age. One thing confused me on day 1: my wallet went from $20 to $18, but the screen said "The till is heavier" and "+$1.15 profit". The supplies-on-hand line explains it, but I think a kid will see the wallet go down next to the word profit and get lost. Maybe slow that moment down on day 1?
Clean art, and the little mascot is cute. Good luck with it!