contact@pianolama.com — read by the adult beginner, usually after practice.
A device where touch feels wrong (which phone, which browser). A latency report that stays high on wired output. Your vote for Web MIDI — it's the most-requested feature and votes genuinely move it up the programme. Song requests for learn mode, especially ones with small steps and honest repeats. And first-song stories: the whole site exists because of one.
Making bluetooth faster (physics holds the pen on that one — the latency note explains). And making the synth sound exactly like your grandmother's Bechstein: five oscillators do their best, but some warmth needs wood.