This is a very cool game, and looks very polished!
The story is very well told at the beginning. The music (which is very good...), animations and other elements are very well orchestrated to create the right atmosphere.
PS: If you want some feedback... I would think about adding a Multiplayer feature (maybe, Netcode in Unity...) so another friend can play with you against the Bosses, especially (because they tend to be difficult to beat... but with a friend or two it would become something even more interesting, due to the 'Networking' factor).
Congratulations.