mpd can be used for this, by configuring a state file. Then you can use a client like ncmpcpp for the terminal or f.ex. Cantata for gui. I believe that Cantata can be used to set up mpd for you, but I’ve never used that feature,

Mostly just fine with i3 my experience. Sometimes I have to move the game window to a different workspace if I want to interact directly with steam, or whatever else I have in the same workspace that I launched the game in, because it keeps forcing it self exclusive/full screen. In some instances, depending on the game, that might mess things up (crash, freeze, missing/stuck mouse cursor), but most of the time it works just fine.