Move with the mouse or WASD or arrow keys.

Your guns fire automatically.

Activate your shockwave using the mouse button or M or Z keys.

Pause with the SPACE bar.

Obliterate enemy alien spaceships as they attack in ever greater numbers.

Use your shockwave to disintegrate enemy photon bullets, block their laser beams and inflict more damage on their spaceships.

You can't reuse your shockwave until the blue power bar in the bottom right corner replenishes.

Collect bonuses ejected from dying ships:

coins - $10 + 5 poins

diamonds - $100 + 25 points

blue - 100 points

green - 500 points

orange - increment score multiplier

Your score multiplier applies to all points awarded for destroying enemies and collecing bonuses up until the end of the level.

Spend accumulated money buying upgrades between levels.