Endless Defense TD
If you are testing through TestFlight, the quickest route is the Send Beta Feedback button in the TestFlight app — it attaches a screenshot and your device details automatically. Email works too.
Create a cloud account under Settings › Account, then sign in with the same account on the new device. Without an account your save lives only on the device it was made on.
Settings › Account › Delete Account. This is permanent and removes your email address and cloud save. Any progress not stored on your device will be lost.
Settings › Privacy. Switching it off stops collection and discards anything still queued.
Tap Restore Purchases under Settings › Purchases. If that does not sort it, email us with the date of the purchase. Note that purchases made in a TestFlight build use Apple's sandbox, are free, and do not carry over to the App Store version.
Please tell us — include your device, iOS version and what you were doing. Crash reports come through automatically, but a description of what you saw is what makes them actionable.