Reddit user ThomasdeB1505 has created a chart categorizing all of the games currently available on Xbox Game Pass. The chart puts each game in the Xbox Game Pass library into a distinct category, from online multiplayer to rhythm games, making it that much easier for subscribers to choose their next game.
The chart does put some games in multiple categories, including Dead Cells, which is classified as both a rogue-lite and Metroidvania. The Xbox Game Pass library does change from time to time, with new games being added and removed fairly regularly, though everything appears to be up to date here.
Game Pass has introduced similar categories, though those are far broader, narrowing selections down to genres as simple as "shooter." This chart not only shows specific categories, but also which games are available exclusively for PC or Xbox, using blue or green borders to display that information, respectively.
The user cited the quarantine as the specific reason for creating the chart, though it's likely useful to many currently remaining at home to avoid the coronavirus. For those still struggling to find a game, Xbox has implemented a "play next" feature, helping users find random games to pass the time with.
Xbox Game Pass is available for Xbox One and PC players.