Avoid "Free Download" Sites: Be wary of sites that offer the game for free via suspicious mirrors. These are often hubs for malware or unwanted adware.
A unique mechanic is the recovery gauge; when health reaches zero, Udonge becomes immobile, and players must mash keys to recover before a monster captures them, leading to various game-over scenes.
Join the Touhou Project Discord server and ask in the #fan-games channel for a verified download link. Enthusiasts often maintain cloud archives with proper hashes (MD5 checksums) to ensure file integrity.