I misread the text on the card myself. There is no error on it. Sorry about that.
I finally managed to achieve the ultimate victory together with a friend. Nice little game. Still very random and a bit basic.

Hi @Man!aC.
I am not the designer of the game, though he knows about this mod.

About difficulty: just like DS (I´m a big fan), knowledge is power. In the last page of the rules you can see the Treasures on each deck. With that info you can make better calls like when to Search (making the monsters move on the track) and when not to. Most items are game changers. Also, the biggest tactical choice is Asigning the Ability dice. NOT because thats how you´ll use them this turn, but because next turn the monsters will attack you before asigning them again.

Choosing to go for a minor victory is a viable choice too.

OTOH, I am a big fan of house rules, specially in solo experiences like this. You should see if some HRs make your game better and share them here. Maybe others will make use of them too.

Regarding the Invisibility Scroll, I don´t see any typos. Maybe just a missing comma, like so: When played, no monsters will move or attack during the next turn.

I just realized you are most likely not Noah Sheola so it is a bit useless to complain here. But I just had to. You may be able to fix a typo on the "Invisibility-spell" card. I think the text is missing a "not".

It's not very fun to die again and again to very random outcomes (d8 defence-die vs d4 goblin-attack-die for example). Maybe it would be better if you had two dice of every kind. So that the outcomes are a bit more normalized. Or if you assign one two and three d4/d6 to your attributes. Something like that.
Finding the shield helps but that is just not very likely. I can see this working but right now it is a bit frustrating and too simplistic/random for my taste. Maybe when my fifth try succeeds I will see this game more favourably.
I think there is a Dark Souls comparsion somewhere in this. Souls games can kick your ass if you don't know what you are doing and it feels very rewarding overcoming that challenge. But that difficulty is based on skill and not on luck. I know some Rogue-like games rely on randomness as a challenge. But a tabletop-game like this probably shouldn't so much. Well maybe I just got unlucky.