I'm confused, because the version you can install for free is literally that: you get the 10 tutorial challenges and 1 subsequent challenge for free, then you have to pay to buy / unlock the full game. How is that different from the classic shareware / demo concept? Obviously it's not banned.
> Demos, betas, and trial versions of your app don’t belong on the App Store – use TestFlight instead.
https://developer.apple.com/app-store/review/guidelines/#bet...
This doesn't apply to a demo with a full product behind it. You can release your "demo" combined as one app, with a small subset of content available for free and the rest locked behind a macrotransaction. Which is what OP already does, except they also have microtransactions targeting children on the side. This essentially only prohibits you from releasing a demo if the demo is for an unfinished product.