Airgrave

The ship can be moved freely around the screen.

Enemies appear in waves both on the ground and in the air.

The ship can take multiple hits, shown through a shield meter in the top left corner.

Destroyed enemies leave behind power-ups.

The plane has access to a special attack for which the meter recharges slowly.

Levels generally end with a boss fight.

Between missions there are short, animated sequences with voice characters where the story is furthered.

When dead, multiple tries are offered through credits system.