Nice overall design to this game! A type of puzzle system I don't see too often, and I like how some of the puzzles are setup. The minimalist sigils on the cards do well to communicate their use, too.
I think I beat level 6 (VI) by exploiting a glitch? I moved my goat down a block to feed the dagger and for a brief moment it still gave blood to the snake card diagonal above it, that was previously it's neighbor. Some weird case like that. There were other little bugs as you mention on the page with the card not registering. Other than that though, still quite playable and enjoyable.
Really good work on this 2nd game jam submission!