Lunar Mirror builds its identity around a mixture of psychological horror, supernatural mystery, puzzle solving, and campus life, creating an experience that is considerably stranger than its initially familiar school setting suggests. Developed and published by DSGame, the story follows Nishimura Qiren after his girlfriend inexplicably disappears. What begins as a personal search soon uncovers connections to unusual school clubs, suspicious midnight activities, other missing students, a mysterious organization, and unanswered events from ten years earlier. The gradual expansion from one disappearance into a much larger conspiracy gives the narrative a strong reason to keep pushing the player deeper into its unsettling world. Its most effective concept is the contrast between everyday campus life and Cthulhu-inspired horror. The game deliberately avoids throwing the protagonist directly into nonstop terror. Instead, ordinary surroundings slowly become corrupted as the investigation advances. Locations and situations that initially appear relatively harmless become increasingly uncomfortable, while supernatural elements begin undermining the player's sense of what can be trusted. This gradual descent works particularly well for cosmic horror because uncertainty becomes as important as direct threats. The protagonist is not simply fighting monsters but attempting to understand circumstances that grow more disturbing with every discovery. The alternating day-and-night structure helps establish a useful rhythm. Daytime is primarily associated with investigating, gathering clues, interacting with the environment, and progressing the mystery. Nighttime pushes Qiren toward more dangerous exploration and the darker truths concealed behind the campus incidents. Dividing the experience this way prevents its horror from becoming monotonous. Quiet periods allow tension to fall before the game begins building it again, while the distinction between investigation and dangerous discovery makes each portion of the cycle feel purposeful. An especially interesting mechanic is the mental-value system. Qiren's psychological condition can deteriorate because of what he encounters, while narrative choices can also influence it. More importantly, mental condition is connected to his field of vision. This gives psychological instability an immediate gameplay consequence instead of presenting sanity as an abstract statistic. Restricting perception as the protagonist becomes mentally compromised fits the themes particularly well because the player becomes less capable of confidently interpreting the surrounding world precisely when the supernatural situation is becoming more threatening. Puzzle solving and clue gathering provide much of the interaction surrounding the story. The mystery continually raises questions about why female students are disappearing, what is really happening during the clubs' nighttime gatherings, what occurred in the past, and what the hidden organization ultimately wants. These overlapping questions make the investigation more substantial than a simple rescue mission. The player's original objective remains emotionally important, but it becomes the doorway into a conspiracy whose implications extend far beyond one missing person. The visual presentation supports this progression by becoming increasingly unsettling alongside the narrative. Rather than maintaining exactly the same atmosphere throughout, the intention is for both scenes and story circumstances to gradually deteriorate. This creates the sensation that the familiar world is coming apart as Qiren approaches the truth. The 2D presentation naturally lacks the physical immediacy of a high-budget 3D horror production, but its illustrations, environments, lighting, and disturbing imagery are better suited to creating an oppressive storybook quality. Mature and sexual content is also part of the package, though it exists alongside a genuine supernatural mystery rather than completely replacing the horror narrative. Choices and the presence of multiple-ending elements add another layer to the experience. Because decisions can interact with the protagonist's mental condition and the broader narrative, there is some incentive to reconsider actions or explore alternative outcomes. The inclusion of numerous achievements further encourages completionists to investigate beyond the most direct route. It remains primarily a story-driven single-player experience, however, so its appeal depends heavily on whether the player enjoys reading, investigating, solving puzzles, and absorbing atmosphere instead of expecting constant combat. The largest weakness is its unfinished status. The available version contains the core gameplay and puzzle concepts, but the original Early Access plans envisioned additional chapters and further development of the story. Steam currently warns that the developer's last update occurred more than three years ago, making those older development plans uncertain. This matters considerably for a narrative game because an elaborate mystery becomes less satisfying when its larger ambitions may remain unresolved. The existing content can still provide an intriguing horror experience, but buyers should treat what is currently available as the important consideration rather than assuming substantial future expansion. Language accessibility is another serious limitation. English is not officially supported, while Simplified Chinese is listed for the interface and subtitles. This creates a substantial obstacle because understanding dialogue, clues, decisions, and story details is fundamental to the experience. Someone unable to comfortably follow the supported language will inevitably lose much of what makes the investigation interesting. Steam Deck compatibility should also be approached cautiously. The Steam store page does not currently provide an official Steam Deck Verified or Playable compatibility rating for the title. Since it is primarily presented as a Windows game and lacks an official Deck compatibility classification, portable players should not assume completely seamless operation. Proton may potentially allow it to run, but compatibility, controls, text readability, video playback, or other game-specific behavior can vary. It is therefore better considered an unverified Steam Deck experience rather than a game specifically optimized for Valve's handheld. Overall, this is an intriguing but imperfect combination of campus mystery and cosmic horror. Its strongest qualities come from the gradual escalation of supernatural events, the day-and-night investigation structure, psychological-state mechanics, puzzle elements, and the unanswered questions driving the conspiracy. The atmosphere succeeds when ordinary school life begins giving way to something increasingly incomprehensible. Its unfinished Early Access condition, limited language support, and uncertain Steam Deck experience prevent it from reaching its full potential, but the underlying concept remains distinctive and appealing for players interested in unusual story-focused horror adventures. Rating: 7/10