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Progress is stored only on the device. Deleting the app or moving to a new device resets it, and there is no account to restore it from — the flip side of collecting no data.
It should recover on its own when you return to the app. If it ever does not, please write — knowing exactly what you were doing helps more than you would think.
Chain your exits. Balls leaving one after another in the same turn are worth several times what they are worth one at a time, and most targets assume at least one good chain.
Always. There is no online feature at all, including leaderboards.
No, but every level you have reached stays open on the level map, so you can go back, practise, and beat your own record.