Putting aside the current situation with MC and Visa, I'd like to give a suggestion for more filter settings.

Basically right now you have a button that has filtration options next to the search bar that gives options for: players, play state, genre, hardware support and features, there is also the option to search via friends and store tags.

What I think would be a good option to add is another setting to search by theme, if you go to the store and hover over the categories tab you can see multiple sections, including a special section and pretty much everything else that you need. I'd like to have theme and the option to filter by development state , in this case I mean things like released, early access and demo (there might be more not sure).

I think that will help you find a game you would like to play but you only have a vague idea of what it is, if it is an anime-style game you can filter by that and see the games in your library that matches that, together with using the tag system it will make a more robust system, and if you could search by development state you can the games you have that are in an early access state instead of searching through your library then click store page.

Well that's my suggestion for the client right now at least.