SuperInk is made by one person. Write to contact@camelstack.com and you will get a reply.
It helps to know which device and OS version you are on, which version of SuperInk you have, and what you were doing when it went wrong. There is also a Feedback entry in the app's menu, which sends the same thing without you having to write an email.
Progress is tied to the device unless you log in. Reinstalling the app, or moving to a new phone, starts you over. Logging in with your email address — from the menu — attaches your progress to that address instead, and it survives from then on.
Some of them nearly are. Tap the advisor on the board for a hint about which border is still unresolved. If you are convinced a puzzle genuinely cannot be solved, say which one and it will be checked.
See the privacy policy and how to delete your account.