TL;DR: It’s a co-op roguelike. Drop in, explore the map, survive 3 days and beat a unique boss.
Once you buy it you get access to the complete package, and there are no battle passes or microtransactions to contend with. It can also be played in singleplayer should you wish to stay offline, with enemy health pools that scale down so that it’s not too overwhelming for solo players (although curiously, there are currently no plans to allow players to play in pairs).
This is so sick I can’t wait.