This is a really charming Metroidvania! And is very very polished, the art and animations were amazing, is satisfying to unlock more sections, and Shiori has so many mechanics to interact with the stages. Also plus for having a menu with many options, I once entered one of the stages again as a mistake, but it was great that there was an option to leave, and return to the hub.
My only suggestion would be to let the player attack at any time, however you could include the current backstab mechanic as a "Bonus Damage", and even as a mechanic to defeat certain types of enemies, like a weak point.
Having said that, My congratulations to all the team involved in the project, you all did an amazing job in this game.