Rules

Clear every enemy in each arena level. Dying records your route, aim, and shots.

Next run, your past selves replay those actions and fight beside you until their route ends.

Focus fire matters: different selves hitting the same target within a short window triggers big combo damage.

After each clear, choose one upgrade. Later levels add more enemies, heavier cannon units, and fast snipers from Level 3.

Small enemies die fast, while bulky cannon enemies are slow but dangerous. A perfect first-run clear is possible, but most wins come from building useful echoes and upgrades.