Noein: Mou Hitori no Kimi e, Houseki no Kuni Recommendations
this is a must watch.
-amazing animation (best I have ever seen I think, episode 8 and 10 you will know what I mean)
-godlike music and voice actors
-mysterious and interesting story
-interesting characters and their interactions and how they evolve as the story progresses.
Similar looking enemies in both shows attack the world and the main characters are trying to find out what these enemies are and where they are coming from.