Nope, at least not on Firefox or edge.

Edit: You have to switch on large puzzle UI in experimental settings.

This looks cool, but even on my desktop the text for the rules is way too small.

I don't think it's "abandoned," I think it's just "done." It's like a $5 indie game made by a solo dev, there isn't an unfinished road map or anything.

IIRC, it's a roguelike card game a la Balatro.