Help and contact
Email tomblackdev@proton.me. Say which phone you're on and what happened; a screenshot helps. Replies usually within a couple of days.
I bought something and didn't get it. Open the store (tap your cores at the top of the screen) and, at the bottom, tap "restore" next to "bought on another device?". If it still isn't there, email with the date of the purchase.
I got a new phone. On the old phone (Android app), keep your account with Google: settings, "keep it with google". On the new phone, tap "played before? sign in with google" on the welcome screen, or the same row in settings, with the same Google account, and your progress comes back. Purchases also come back with "restore" in the store. Lost the old phone without signing in? Email, and say your pilot name.
Steering feels wrong. Settings has tilt, drag and tap-sides steering, each with its own sensitivity, and where the boost button sits.
The game runs slowly. Turn on performance mode in settings.
How do I change my pilot name? Settings, at the top.
How do I delete my account? Settings, then "delete my account and data". See the privacy policy for what that removes.