They only intend to fund development for a year with this kickstarter, and try to get a publisher on board once they’ve shown there is interest. That information should’ve been closer to the top though, a bit buried down there.

From the site:

We do want to make it clear, however, that our aim with your pledges is to fund full-time development for one year in order to produce an early access build. We would release this early access build to the appropriate backers and take feedback as we continue to release updates. We also aim to take this early access build to publishers to seek further funding, with the goal of completing the entire game.

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.