This app was mentioned in 20 comments, with an average of 1.80 upvotes
It's literally an idle game about killing gods.
The premise is that you're the last human alive in a universe ruled by the gods of various mythologies. Your goal is to idle your abilities up to the point that you can kill these gods in order of difficulty or "toughness", generally by fighting weaker creatures like slimes, wolves, and kobolds. It's even got a sort of story behind everything that updates every time you reach a new milestone.
I enjoyed it fairly well last I played and it's been a few years, so it's probably updated quite a bit since then. Might be worth a look, it's free on Android and Steam. Not sure about iOS, but I think they have an app there too.
I'm on mobile at the moment, so I've only got the Android link at the moment. Shouldn't be hard to find on Steam if that's where you'd prefer to play it.
https://play.google.com/store/apps/details?id=de.shugasu.itrtg
Idling to Rule the Gods might be a good option. No direct clicking mechanism, lots of long term progress goals, and good offline progress. https://play.google.com/store/apps/details?id=de.shugasu.itrtg
Kittens game is another good one, but I find that while it has offline progress it feels lackluster and kind of unclear in that regard. https://play.google.com/store/apps/details?id=com.nuclearunicorn.kittensgame
Are you looking for the game Idling to Rule the Gods? https://play.google.com/store/apps/details?id=de.shugasu.itrtg&hl=en
This game has a story element similar to this where the human in question can end up becoming the most powerful god.
Idling to Rule the Gods has a mobile version which if you haven't played that, you should consider.
https://play.google.com/store/apps/details?id=de.shugasu.itrtg&hl=en
Idling to rule the gods just got ported by the developer to Android. I suggest you check that one out. Link to Google Play
Let me help you android
Be careful this game cost me 4 years of my life. And I’m still crazy about it
Idling to Rule the Gods - 4.5 rating - Free with IAP - Search manually
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ITRTG is available on Android.
Here's the Android version of ItRtG.