Well, if that's how you feel, I don't think there is any changing that (the changelog is public, after all, so anyone can make of it what they want). If you want to check what's in the game for the demon realm currently, you can check it in the travel sphere (I'd say it's roughly 50% complete at the moment). It won't be a whole new world, but it should be larger than the usual trip in a temple, let's say (plus, it will have a fork depending on whether you did find all three secret Hanatora's statues or not).
I kept handling the side quests in the meantime because I didn't want to drop the ending without having addressed most of the side content, at least (plus, I got some time to commission art for some of the endings, this way). Admittedly, more new content also made its way in my plans here and there, so it's taking longer than it should.
Ultimately, I don't know what to tell you. If the game isn't worth your time even for free, it's probably not a good game (either in general, or for you personally), and yeah, you should play whatever is worth it, instead. If you feel like I am messing around, I would say I am not, but again, the changelog is public (and I discuss the development every week), so I certainly don't need to tell you what to think about the game or my efforts, you can draw your own conclusions.