Player drop does not equal "dead", especially on a game where player count means absolutely nothing overall (not an open world MMORPG)

Player count dropped (probably) since many people have finished all the current content and are just waiting for the next big content update and/or waiting for full release of the game, before coming back.

The numbers will go back up once a major update drops, but again, that doesn't actually matter for this kind of game (solo play or coop with friends 1-10 players)