I played one Simmer round in the browser without the tutorial, so this is a first-timer's read. (I sell asset packs on itch and write with AI help, so weigh that.)
Tutorial: I cooked the Strawberry Milk Cake for 2 stars without it. The one thing that stalled me was the hint "switch exactly one ✗ card to ✓". Tapping Eggs in the recipe-book pantry did nothing. Switching only works after Lock & Cook, and it needs a second tap on the ✓. Adding "on the cooking table" to the hint would fix it.
Mechanics: clear after one round. The steps vanish once you lock, and that's the good tension.
Worth paying for: a round lasts 60 seconds, so the page has to sell depth. Your screenshots bury it: the recipe-book spread, which shows the most dishes at once, is 6th of 8. The Kitchen Journal with every stamp greyed out is 2nd, and the 3rd still has a Windows title bar across the top. I'd lead with the book spread and the "50 dishes, 11 cuisines" line.
Assets: I don't know of a painted set that matches yours. Pixel food would clash with it.