Apps are still locked after my walk.

Apple Health updates in the background about once an hour. Open LIFE.GG and the lock lifts as soon as it reads 5,000 steps and 30 exercise minutes.

The Watch app is missing.

On your iPhone, open the Watch app, scroll to Available Apps and install LIFE.GG.

My XP or a closed day looks wrong.

XP and closed days are worked out from your checkmarks each time, never stored as a number, so fixing a missed checkmark for an earlier day corrects them.

How do I delete my account?

In the iPhone app, open Settings from the gear on Today and choose Delete account. It removes everything you logged and your sign-in, and cannot be undone.