Tide Trace is a sand-and-tide puzzle game. It is designed to work offline for core gameplay.
None by the developer. The app does not require an account, does not include advertising or analytics SDKs, and does not send gameplay data to developer servers.
Progress and settings (for example completed levels and audio preferences) stay on your device.
Questions: open an issue on the public legal/support site repository, or use the developer contact shown on the App Store product page.