I tried to login but it is NOT asking for nsec option. I looked at your video and it is asking for login extension but on the actually web page, it is not available. Btw, I do not have Alby yet even though I register on their waiting list. My immediate thoughts of your app, is the login. I'd say I am tech savvy but not all people are so this maybe a detractor unless your target audience are techy people and not those non-tech. If the latter then convenience must be a priority without having to go through GitHub or something to install anything. People get intimidated by seeing code.
Why I say github because I was clicking "other key stores" and got directed to a github.

I have not use nsec.app nor other keystore. You have a page for FAQ but in order to get further info I need to install Telegram which an app I do not use. The login journey is not straightforward to me and it takes a lot of user effort. I hope this helps! 🤓