I know it's not a lot right now but I just wanted to project my idea. Like the other day I was thinking to myself that the game should follow kind of like animal themed or something. Like Hollow Knight, Hollow Knight is a bug themed metroidvania which executes its environments perfectly.
So I am starting to design the protagonist and I quickly searched "light warrior" or "warrior of light". The images I got was a figure with wings, which would make sense as like light is directed to divine or hope which was what I was going for. When the wings came up I was like maybe I could do the game bird themed. Maybe bird themed is a little cheesy at the moment but I feel that it could have a lot of potential gameplay wise.