Absolutely delightful.
I really enjoyed learning about the world of this game, and I was really impressed with how the narrative shifts depending on the choices you make about Cassadin's personality and attitude! I didn't expect so many callbacks throughout the story to choices I made near the beginning, and it made the story particularly immersive (it also made me replay extra times after I'd seen all the endings, just to hunt for more interesting tidbits).
I especially wanted to share my appreciation of the friendship routes -- I started with the one where
(SPOILERS) Cassadin and Heimos become pen pals, and I found it really sweet. The thought of this scared, sad young man being ostracized by his village, only to decide he wanted that he wanted to live back at his old home and make sure nobody had to suffer like he had... It was really lovely.
Also, Violo's incursion was very exciting. I'm glad I'll get to see more of him and Vivere in Sacrarium Pario! (/SPOILERS)