@Hiraelle
Death Parade, Stein's Gate, Boku dake ga Inai Machi, Gungrave, and Ao no Exorcist are all spectacular anime, but... all of those are pretty intense mixed feels.

Made in Abyss has some intense bits, but it has overall more of a lighthearted feel, or better yet, if you liked Gurren Lagann but haven't watched Kill La Kill, that's an excellent place to go