It's a work of art.
The story sounds simple at first, however, as things advance, it gets more and more complex, with more and more layers and the characters have so much importance that their own stories make the general, background story even richer. For those who read the manga and know more than what the anime shows, this first season only got to introduce a little of what the big story of Lost Canvas is.
The art is amazing, the animation is perfect, the colors, the angles, the way the scenes were directed. The art is basically alive, being creepy when it has to, being pretty and soft when it needs, and also very violent and brutal when it has to be. The voice acting and sound effects are very good, but I missed the intensity and tragedy of the background music the older Saint Seiya animes offered us, however, definitely it's more than the basic, it makes the anime richer.
The characters are the best thing about Lost Canvas in my opinion. Even support characters get the respect and attention they deserve, everyone is important somehow and most of them get some background, development and a proper closing, when it's the case. The support characters that didn't get that in these episodes definitely got more attention in "season 2" or in the manga.
I loved the facts the story it's not "unilateral protagonist" like, every character has a role.
I had a lot of fun watching, honestly, I wanted more, too bad this anime didn't get the success it deserved.