I liked the vibes but it needs a more work across all fields to make it a smoother experience.
I'd move the settings panel from where you have it now. I've opened it so many times while trying to find my next unlock.
And while at UI/UX, I wish there was a 'lock' panel checkbox so I can play the game and click away, while reading what some of the Vassals, Rites or Covenants do. Especially early on when you have to click, it felt like a chore trying to read what to invest in next with the FOMO running in the background.
I wish there was an earlier 'auto-attack', some of the passive income deserve some visual feedback and that could be one.
The Covenant tree, when you hover the nodes sometimes it goes bananas and flickers up and down.
Rites with #notinthegame label - a bunch of them. Display them when they actually exist in the game.
It wasn't clear from the start that I didn't had any Ichor's, I guess I got tricked by the +X at the top right and I tried a few times to either Long Death or to get a new Covenant. I thought it was bugged.
I stopped after first Long Death and purchasing Soulweight 1.
Sorry I had so many observations. It's not like I'm a master of Idle games; it's just feedback that I think it will make for a better experience.
Good luck with the project!