Like I mentioned in the thread im not too familiar with zeldalikes, but here are my thoughts.
First, I am probably just a dumbass, but I almost got filtered out by the starting menu. I figured out you move the hat to select the game start. But I though I had to move to the statue and hit a button to accept the option. Not sure how I finally clued in that I just keep moving passed the statue, probably just got lucky lol.
I think the card tutorial and tutorial with the owels did a good enough job to help me figure out what is going on. I was a bit confused why C didnt do anything. Once I got my first item it became obvious how it worked. I managed to get to the end of the demo. Got the sword, and then the spooky ghost told me the demo is over.
It feels like outside the dungeons there are sometimes just a pointlessly large amount of enemies on the map. It also feels like there is usually no reason to fight them and its better to just walk around them to get where I want to go. I noticed that the amount and locations spawned seems to be random. Maybe have a game design reason to want the amount spawning to vary but I would think about limit the variance of how many enemies spawn. Having the locations be random is fine, and even good however.
I feel like the player/door hitbox is a bit tight. Like in the pic below, the player is colliding with the wall, but I feel like I should be able to just keep walking into the door.
The spell book and items system is neat. I do wonder how you plan to handle adding more items and spells in the future though? Seems like you restricted yourself to having the 4 sets, at least with the current control setup.
Overall game seems well polished though. Again not really a zeldalikes kind of gamer, so take my opinions with an extra grain of salt. Seems like a game with potential though, hope to see you continue to progress on it in the future!