Here’s a concise review of based on its typical presentation as a mobile or indie pixel-art game (assuming the common genre traits, as the title isn’t a major mainstream release).

In (developed by Pixel Factory), a core feature that fits the existing 2D survival horror and "eroge" platformer mechanics is a Stealth-Based Infection/Evolution System . Proposed Feature: "Symbiotic Adaptation"

aims to remake the game in a new engine and port it to Android, with development currently ongoing. Community & Legacy Parasite in City GOG Dreamlist

The game is known for its high difficulty and explicit "game over" or "lose" states involving the protagonist and the creatures.