Really nice!
For the Grimoire I’d suggest having the tooltip info just show when at the item instead of needing to press another key to see.
Some text overlapping in the Bestiary you may want to tweak
In the how to play screen I’d suggest bolding the actions to help separate them out
The familiar mentioned a flask when it was offscreen, may wait or have the camera adjust to ensure it’s on screen and maybe flash while it’s talking about it
I’d try to make a bigger deal with the level ups, flash the screen, make a big noise, etc. since it’s a big deal.
Perhaps switch between music when going to the gameplay itself?
Consider a knockback when the runes hit the enemies?
Looking forward to the final version!