I feel like it's not fair to judge this on the same basis as other anime, as it is clearly way too unique in it's format. Tori No Uta is really closer to an image book with the text being read out loud instead of written on the pages, given that the visual aspect of it consists of a succession of Yoshitaka Amano's paintings, with voice-overs for the narration and dialogue. It's a very surreal, quite literally dreamlike experience as most of the story revolves around exploring the two main characters' dreams. There's a lot of room for personal interpretation, a lot of elements areclearly metaphorical and each dream gives you a lot of insight into the psyche of the characters, while also being strange and full of creativity. The broad strokes of the story are easy to follow though, and the art, despite the lack of animation, is extremely beautiful, intricate and expressive, which makes it easy to get invested.

I don't think it's an anime for everyone, you have to be open to unconventional and experimental stuff, but if you are I think you might find it to be a very enchanting and intriguing experience, I know I did, and I think it has the potential to resonate with you quite deeply if you find a little bit of yourself in the characters and their dreams. And besides that, if you're into Yoshitaka Amano's art, it's just a pure visual treat.