You are a beast. A wobbly third-person Gang Beasts beast, built on Gang Beasts' own ragdoll rig and wearing a random Gang Beasts costume. Anemoiapolis plays as usual: its doors, puzzles, water and story all still work.
Arms like Gang Beasts. Left and right mouse are your left and right arms. Tap to punch, hold to raise the arm and grip whatever the hand touches: objects, ledges or other beasts. Drag them around, or hang from a ledge.
E: headbutt and climb. E is a headbutt. While a hand grips a ledge, an object or a beast, E pulls you up onto it. When Anemoiapolis shows its own [E] prompt, E does that instead.
Knockouts like Gang Beasts. Hits fill a knockout meter (head hits count double) that drains if you back off. When it's full the beast goes out cold (zZz), longer each time, and wakes up groggy. It works both ways.
Wanderers. Up to three more beasts (medium, big and tiny, each in its own costume and voice) walk the empty halls, mumbling in Gang Beasts voices. If one sees you it comes over to fight: it punches you, or grabs you and throws you into the nearest pool.
F2 turns enemy spawning on or off (saved). V switches between third person and Anemoiapolis's own first-person view.
Solo, single player.
Needs both games: Anemoiapolis (the game you play) and Gang Beasts. The beasts, costumes and sounds are read from your own Gang Beasts install while you play, and nothing from either game is copied.
Built on BepInEx 5 (included, LGPL-2.1, by the BepInEx team).