Roughly weekly
Six timestamps across twelve weeks (Aug 17 → Oct 8) is close to the weekly cadence this genre's players expect, and it matches the description asking players to like and favorite "for future updates" — the update train is how the game markets itself.
What a bump usually is
In incremental clickers of this shape, a metadata bump typically means new stages or walls, a rebalance of values, a new Pet/Title/Skin batch, or a promoted boost tag swap. Which of those it was gets confirmed by opening the game — this page will never guess one.
Why not patch notes
The developer runs no changelog this project could verify (see the source register), and player-made "update leak" summaries mix in the same-name game. Dated metadata plus in-game confirmation is the honest substitute.