How to Play
Your ship drifts in a gravity field around a small planet at the center of the screen. Gravity pulls you toward the planet the whole time, so flying is about managing an orbit, not just pointing and thrusting. Shoot the rocks orbiting the planet before they — or the planet's pull — bring you down. Destroying a large rock splits it into two smaller, faster fragments; only the smallest fragments are destroyed outright. Clear every rock to start the next wave. Every fifth wave adds a tougher boss rock with its own health bar.
The playfield wraps: fly off one edge of the screen and you reappear on the opposite edge, still moving the same way -- so does every rock, bullet and power-up. Fly close past the planet at speed for a slingshot: a brief gravity-assist window that doubles your score for a few seconds. Chain kills quickly to build a combo multiplier. Ammo is unlimited -- hold fire to keep shooting at a steady rate. Destroyed rocks sometimes drop power-ups: a shield that absorbs one hit, rapid-fire, a score multiplier, and a slow-time field that gives you more room to maneuver.
Controls
| Rotate | Left / Right arrow keys, or A / D |
|---|---|
| Thrust | Up arrow, or W |
| Fire | Space bar (hold to fire continuously -- unlimited ammo) |
| Pause | P |
| Touch devices | On-screen rotate, thrust and fire buttons appear automatically |
About this game
Orbit Breaker: Rock Siege is an original arcade space-rock shooter: it is not a copy or reskin of any existing game. The orbital gravity field, screen-wrapping playfield, slingshot bonus, and power-up set are this game's own design. All art is drawn live on an HTML canvas (no images shipped) and every sound effect is synthesized at runtime with the WebAudio API (no audio files). It runs entirely in your browser — nothing is installed, no account is needed, and local high scores are kept only on your own device.
Read the full How to Play guide for every control scheme, every power-up, how the slingshot bonus works, scoring, and tips for a higher score.