The art STYLE, character design and coloring were amazing but not enough to mask the lack of animation integrity, it was very noticeable, the reused scenes and lack of character movement.
Character development was so-so and more focused on the villain which is fine, but his name wasn't mentioned enough to remember.
However the sound effects, score and story were enough to keep me engaged, which is a first for me.
I don't know why this is marketed as an anime but it's not. Lastly, it's inferior all around to Castlevania, but eclipses it in potential which is why I give it 4 stars.