For example, there are games that I have "beaten", but don't consider "completed" yet. When I'm still actively playing those games to complete them, I want to be able to set the game's status to "active" and "beaten" at the same time.

When adding new games to collection, add the option to have "Unplayed" status, instead of having to use the "undecided".

Add option for "unbeatable games", such as games that have no real objective, like party games (e.g. Dad Beat Dads, Jackbox Party). It would be nice to be able to say that "Hey, no goal. Just a fun game."

Going through some of my own Steam library, there were many games picked up through bundles or sales that I, (being honest with myself) will never play. Either they don't look interesting, or I know they're terrible games. Can we have an option for "Won't Play", or "Regret" to differentiate them from "Undecided"?

I think that there should be a 'replaying' or 'replayed' option to games. I often like to play through games again and it would be nice to have this option.

I am also confused about the difference between 'completed' and 'mastered', and I wonder if both are really needed.

If I played a game's demo, it doesn't mean I own that game, but they'll come when I sync my account anyway. Also, some games release demos before the full game (i.e. Resident Evil 7), and I would like to see the release date for both. I would also like to know if the games on my wishlist have demos available, so I can try before I buy.

Wishlist and Want to Play could be combined into a single category.
Beaten, Completed and Mastered could be combined into a single category.
I feel that active, paused and abandoned could adopt a green, yellow, red light option, and not be a list on the sidebar.
I think the New List option will take care of the needs of individual gamers.

Add an option to sort by user reviews (just like on steamdb.info)

E.g. Origin, Uplay, Epic Launcher, Battle.net, Windows Store... There are a few games that are other store exclusives so they don't show up in my Steam library, would be nice if they were kept in sync, too.

I have a lot of games, and every once in while I like to trade or sell some of the titles I haven't played in a while. Often this can mean me selling off an entire console and all the games that I have for it. I would be useful if you could integrate with ebay or some other source to come up with an estimated asking price for each game so I could easily see what a fair value for my games / groups of games is.

Rather than solely Steam.

Would be nice if you could specify which consoles you own so that When you search for a new game, it would show you games for your consoles first. This would greatly improve relevance of top search results. Bonus points for "console wish list", "own but don't play any more" and "used to own" to display after your current consoles but before other consoles.

It will be nice to have a context menu to change a single game properties. This will save lots of extra clicking :).

Very cool feature is set own covers for games. Because I would like set cover my edition, for example my language version. I am an esthete and i would have to cover the same dimensions and boxes for each platform. :)

It should be possible to import owned games from other sources than just Steam - GOG, for example.

I currently have a workaround right now where I am using this site to store my account names and passwords via LastPass off each individual game page currently, but would be amazing to be able to store this information secured and locally, while referencing our games list online.

Would be nice to be able to have a clan setup that allows us enroll members so we can track who is playing which game, and have their associated guild tags or contact information available.

The clan members contact info should be visible only for other clan members.

We have a long established online guild (22 years now) and have always had an issue maintaining communication outside of ventrilo or teamspeak style avenues. This website could bridge that possibly.