SwingByByBy

Your mouse cursor becomes Earth.

SwingByByBy is a mouse-only physics score attack where you use Earth’s gravity to swing comets around and smash planets for points.

You do not control a spaceship, a cannon, or a projectile. You move Earth itself on the screen. Earth has gravity, and incoming comets bend their trajectories as they are pulled by it.

Pull a comet in, swing it around, and send it crashing into a planet. Destroying planets raises your score. Keep using the same comet, and your combo grows even higher.

But comets are not your allies.

If a comet drifts too far away, it disappears and your combo breaks. Pull it too close, and it collides with Earth. The moment that happens, the run is over. Your score, your combo, and the flow you were building vanish in an instant.

That is why this game is not about staying safely away from danger.

It is about keeping a dangerous comet close while it remains dangerous.

You need it near. But not too near.

You do not want to let go. But hold on too tightly and it is over.

The controls are simple: move the mouse.

But shaping the orbit you want takes distance, speed, angle, and a little patience.

At Tokyo Game Dungeon 12, many playtesters described the game as hard in just the right way. Many also said that when they got a game over, it felt like the result of their own control.

It is not unfair.

But it is not easy.

When it works, the comet races around Earth and destroys planets in a chain. When it fails, you understand why. That is why it hurts. That is why you want one more run.

Features

• Simple mouse-only controls

• Intuitive physics action built around bending comet trajectories with Earth’s gravity

• A unique score attack about swinging comets into planets

• Tense risk management where pulling too close ends the run instantly

• High difficulty that feels fair because failures are readable

• Replayability that makes even short sessions create a strong one-more-run pull

Game Modes

• Score Attack: Chase a high score within a time limit

• Endless: No time limit. See how long you can keep going

This is not a game about avoiding comets.

It is a game about refusing to let them go.