Signalis

The core gameplay consists of top-down shooter elements from a top-down 2.5D perspective, with occasional puzzle elements. Puzzles vary from manipulating switches and dials, to searching for certain radio frequencies.

Difficulty and thematic elements are enhanced through the use of resource management as a gameplay and narrative mechanic. Elster is limited to six items on her person, including weapons, ammunition and key items for use in puzzle-solving and unlocking doors. In the fashion of Resident Evil, another survival horror series, there are safe rooms that allow the player to save progress and store their items for future use.

Signalis is set in a retrofuturist world, in a planetary system reminiscent of the Solar System that is governed by the totalitarian Eusan Nation, which remains at war with the Eusan Empire, from which it has revolted. The Nation employs Replikas, "biosynthetic clones manufactured to emulate model workers and soldiers". Also within the game are humans, or Gestalts, defined in-universe as "a person that is not a Replika".

The player character, Elster, is a ship technician Replika unit who awakens from suspended animation in the wreck of her crashed scout shuttle and sets out to look for the human pilot of her ship. Entering a vast mining facility, she must puzzle out the strange, possibly supernatural plague which has killed most of the staff and survive the remaining "Corrupted". As Elster searches for her shipmate, she uncovers lost memories and forgotten relationships as she enters a recursive time loop. The game has yuri themes throughout the story, as it is slowly revealed that Elster is in search of her female Gestalt lover. The game features multiple endings depending on the choices of the player.

The game was developed by the two person German studio rose-engine, with development beginning in 2014. The initial version of the game, created as a university project by Stern and Wittmann, was a 2D side-scrolling shooter game. After seeing positive reception to the initial prototype, Stern and Wittmann began developing the game further and turning it into a top-down horror game. Additional help was brought on through external composers.

The game was released across multiple platforms on October 27, 2022. The game was published by Humble Games and Playism.

Signalis received "generally favorable" reviews, according to review aggregator Metacritic, and 85% of critics recommended the game, according to OpenCritic. Critics generally praised the atmosphere and environmental storytelling of the game, although the limited inventory and combat received criticism.

Many reviewers offered praise of the overall game, while noting individual aspects they felt held it back. The Verge noted issues with a few puzzles, but praised the overall game. GameSpot called aiming in the game "unreliable", while Nintendo Life critiqued that the boss fights of the game were not well suited to the combat system. PC Gamer briefly criticized the game's inventory system, yet rated Signalis a 92%, saying the game "joins that coveted pantheon as one of the best in the (sci-fi horror adventure) genre (...)."