I feel like the previous version (0.3.9) was a bit more fun with the spell creation and augmentation, especially when combining with Amass Power. Also made most cap raises trivial, since you could do a lot of it with spells, not just upgrades.
In 0.4.2, capacity is the name of the game. At a certain point, you must play with potions to get to the next stage. Sadly, the game hardcaps shortly after, there's no way I can reach 1000M Ceremony or Elementia, with upgrades that can only give +8/+12 capacity, and no percentage capacity increases.
The few things I miss from 0.3.9 are brewing multiple potions at a time, and having more than 2 potions in the toolbelt. Also there's so many resources/items available now that keeping track of them is a little annoying, so here's my bid for a "condense stats" toggle where they can all fit on the screen without the need to scroll up or down.
The big thing I like is the combat/rituals mechanic, combined with the additional spell loadout it was fun to play with, but unless there's more (realistically accessible) upgrades hidden behind some high level thing, I think I have to wait for the next version.