Starmada

Move your ship using either the mouse or the arrow or WASD keys.

Your guns fire automatically.

Activate your repulsion-wave with the left mouse-button or X or M key.
The repulser functions defensively by destroying all enemy bullets it touches and blocking enemy beam weapons.
It also has an offensive function, inflicting damage on all enemies in range.

An upgraded repulser can be an effective means of quickly annihilating large groups of closely packed enemies.

Dying enemies eject treasure worth money you can spend in the shop on upgrades, stars for extra points and power-ups which replenish health, increase lives, increase score-multiplier or activate shields.

Annihilate all enemies in a formation to gain a squad-bonus worth extra points.
Enemies armed with beam-weapons unleash a shockwave when they explode, similar in effect to your repulser, this can be helpful when fighting hordes of enemies.