Loopwright

You are the last observer of a stopped observatory. Each loop lasts 8 turns; when it ends, your past self replays every move beside you. Hold plates open with your ghosts, ride the return belt to send a crate into the past, and when the same crate meets itself, space collapses into a singularity that opens the way. 3 stages. Controls: arrows/WASD move, Space wait, Enter commit loop, Z undo, R retry loop, Backspace erase ghost, H hint.