1. Yes, the PC version is the same as the iOS version so should be equally blind accessible.
2. Unfortunately there's no way to sell an iOS app from itch.io or for itch.io to know that you've bought it from the App Store, so yes you'd have to buy it again.
3. There's no required typing. You can optionally rename your spaceship and explorers, and that involves typing in a new name, but if you choose not to do this then there's no typing.