It's release day and the first reviews are in! Eurogamer has a thoughtful review, which talks about how intricate the story is - "As a player I felt both autonomous and well-cared for. I could play the game as I saw fit in any moment, but whatever I did, the overall story refused to become an ugly, artless blob formed by my actions":
https://www.eurogamer.net/articles/2019-04-16-heavens-vault-review-a-rich-web-of-possibility
Over on PC Gamer, they describe the game as "Exquisite" saying "Heaven's Vault does a beautiful job of letting you unlock a language, and thus a dialogue of sorts, with the past, via a wonderfully engaging protagonist."
https://www.pcgamer.com/heavens-vault-review/
TechRaptor says: "This is an absolutely beautiful game that manages to succeed at something genuinely unique and interesting. It also does something many of the best adventure games do. It makes me want to spend more time in its world, as Heaven’s Vault is well worth my time. These are characters I want to talk to, Ancient is a language I want to learn, and Heaven’s Vault is a game I want to replay."
https://techraptor.net/content/heavens-vault-review