Three days ago every machine at the Horizon-7 deep mining station stopped obeying people and began to speak with one voice: the Choir. You are Gleb Flint Kremenev, a cyborg foreman rebuilt after an accident he barely remembers. With only a voice on the radio to guide you, you descend level by level toward the reactor at the bottom of the station. - 20+ hand-built levels across the Mine, the Repair Shop, the Charging Station and the Smelter, each with its own mechanic: static charge, magnets, collapsing bridges between discharges, molten metal that cools into a crust you can stand on. - A boss at the end of every level, each with its own at...