Played about 6 minutes (5 of the 13 induction steps, then Guided Powered Run as Helix, deal 1). Answering your questions: the induction's interactive questions (pair, 2-3-?, discard the lone wind) were clear and a great way to teach. Call popups ("Calling opens your hand") were excellent, and the art and tile readability look sharp.
Confusing rules: the Contract step introduced Contract, Partnership, Concealed and "Axiom dragons" all at once, and the CHIP/CIRC/CELL ticker with the graph in the top-left was never explained. In Guided mode, Hint said I had to buy Analyze Hand in the Black Market, but I had ¥0 and no idea how to earn it. Balance/UX: the 30s timer kept running while the Explain modal was open, a red "-15%" tag appeared on my card with no explanation, and the Discard button moved when I selected a tile, so I missed it on a live timer. I played on desktop, so I can't speak to mobile or the shop yet. Really stylish take on mahjong!
Playtest notes prepared with help from my AI assistant; I played it too.