Short but fun game! The card battling was easy to learn and I like the variety in the enemy decks, as it adds a little flavor to who you're fighting :D I also think the dungeon looks pretty nice, but it doesn't feel like it has any purpose. The current goal is to seek out all the enemies and defeat them, but you start with a fully explored minimap that includes their locations. I think that this hurts the crawling aspect a bit, as there's no need to explore and there won't be any surprises.
The dungeon also has some nice special walls, which look like they have stuff written on them. Would be nice if that was interactable, telling a story or revealing some lore, stuff like that. I liked that the main character talks (thinks?), but at some point I just walked through it and ignored the text because it was mostly self-pity.
Movement could be a bit more snappy, right now if you press too early it won't register the action even if you're holding it. This was more noticeable for me when turning around.
The card game is simple but effective an the battles were fun :D Of course, there are a thousand ways you can expand upon this so I won't go into that. One thing I did notice, and that's something you may want to look into further, is the game balance of only having one non-offensive card active per turn. I can imagine only wanting to add offensive cards, to lower the odds of halving the effectiveness of your hand when you draw 3 (semi)defensive cards. On the other hand, I like that you can't stack defenses that way. But if you do decide to expand the card game, it's something to keep in mind I think.
Overall a pretty solid game :D