It's actually just a webln connection for a browser extension wallet. So you can connect your Alby and just use this as a face for it. It's also (hopefully obviously) just for fun. You can use your Alby or another extension wallet with it, but there's no utility except a different look.

All this to say, you need to connect the browser extension wallet before you can do anything.

Here's another one for a different feel.
https://arcadewallet.vercel.app/