I read the scroll the first time, but instinctively went; "got dmg spell, lets kill skeleton" only to realise he's gonna pound me into a wall and kill me xD
I played the game again, and got past the first skeleton, but the game is still rather hard(one mistake and an enemy will just walk up and kill you).
Once i got the spider climb spell cast, i did not remember it afterwards, the only spell i remembered was call lightning because it was powerful enough and by constantly reminding myself the "code" 1-2-5,1-2-4,2.
Remembering spells like that is really difficult, especially when its multiple spells.
I plays into your story very well though.
Also the hands on the scroll are kinda hard to read + when i think i did it right, but nothing happened, its hard to figure out which finger was not supposed to be up.
The system is very interesting and cool, if it is also easier to use.
so yeah, tldr; hands on scrolls are hard to read/understand, spells are hard to remember.