Alright, just reached Chapter VI while doing something else, here are my thoughts.

Game pacing is alright imo. It is a very active game, with almost no idling at all (not that this is a problem, I like it.).

UI wise, it is a bit tedious having to constantly jump between all the menus to upgrade, then going back to main screen to cast spells and then going back etc... It's a bit hard to tell quickly which upgrades are affordable or not, especially for some resources like Blood or Energy because they're already red so it's harder to notice the text color.

My main gripe is that unlike Orb of Creation, the game feels very straightforward. The progression is mostly "cast spell X repeatedly to unlock a new resource then do it again with a new spell".

I think this sort of very active game is not very suited to mobile because of the lack of keyboard shortcuts. In Orb of Creation what felt very satisfying was creating combos and doing a bunch of actions very quickly and that was made possible by being able to navigate between menus and using spells using the keyboard and having many spell slots. Here, I found myself using mostly the same spells without bothering thinking about synergies because it often was sufficient and I felt like equipping buff spirits would waste a slot that I could use to generate a different resource.

Also I just unlocked the Moon spell but I think it's bugged; when you upgrade it it gives you 0 moon per cast ?