From VG247: “The game, which is currently available on Xbox Game Pass, is going to expand out with a free new challenge mode, as well as paid DLC that will add a bunch of content to the game.
The details of these upcoming additions have been outlined in a Steam post on the games page, which has promised a new challenge mode is incoming, and will be free for all players.”
Source: N4G PC Cool roguelike shooter Void Bastards is getting a free challenge mode and paid DLC