Each sector lasts at least 120 seconds and you must destroy its boss to advance; picking upgrades between sectors does not count toward combat time. Boss fights run longer if your firepower is low. Training runs play a single sector and do not count toward the campaign record.
- Touch / Mouse
- Press and drag anywhere on the battlefield. The ship fires automatically and moves relative to your drag, so it never jumps to your finger. The three buttons below are always available.
- Keyboard
- WASD / arrow keys to move; Shift for slow focus; Space for bomb; E for Overdrive; P / Esc to pause.
- Shield and survival
- The small glowing dot at the center is your hit core. About 2 seconds of invulnerability after a hit; dodge for 13 seconds straight to start regenerating shield. Between sectors you repair 2 hull, refill shield and gain 1 bomb.
- Weapon drops
- Blue spread, green pierce, purple homing, gold blast. Drops bounce around the field for 10 seconds; picking up the same type levels it up to Lv.5, switching types keeps your level.
- Scoring high
- Chain kills to stack a combo multiplier up to ×5; grazing bullets adds score and Overdrive charge. Overdrive lasts 8 seconds, clears bullets on activation, and you still have to dodge new fire.
- Pause and continue
- Switching away pauses automatically. You can continue up to 3 times: the current sector restarts, 35% of your score is deducted, and upgrades are kept. The campaign best is stored only in this browser.