I seriously don't get the idea behind daily challenges unless you want to keep users hooked to extract some value from them, but that doesn't seem to be the case here, as there are no ads.
Just show all the different levels at once.
> you want to keep users hooked to extract some value from them
Ironically, that's what I initially liked about the daily puzzles like Wordle: they forcibly prevented you from sinking too much time into them. It was sort of like, "hey here's something cool, and I'm going to make sure it's a positive addition to your life by preventing you from succumbing to your own addictive impulses". You could call that condescending or infantilizing, but to me it's just part of the look and feel of a thing. Especially if the author isn't charging money, they get to use whatever tools are at their disposal to craft the users' experience of it. Wordle Over And Over Again is a different game than Wordle Once Daily. (And WOAOA done properly would probably have a progression of difficulties, or themes, or something, whereas WOD makes more sense with pure randomness.)
I assume that "all the different levels" might not exist yet. The author is probably creating them a bit in advance, and will keep going as long as they're motivated. Having a regular schedule for new releases helps, and doing it daily seems as sensible as any other schedule.
If you click the menu button in the top right you can play all the past puzzles
That's fine. So these kind of games aren't for you, then. Remember crosswords in newspapers? Yeah, think of it like that. You don't get hooked until you cannot let go, you get a limited chunk served each day. Same with Wordle.