Typhoon

Typhoon is a vertically scrolling shooter in which the player uses a space
ship to kill aliens. The game has about 50 levels in changing environments,
e.g. an asteroid belt, a jungle or a futuristic city. Special symbols,
available at the beginning of each level, grant an extra life or one of three
special upgrades (like a better weapon or a shield). The latter are only
temporary.

The game features two especially dangerous enemies: indestructible, rotating
plates and skulls which grant instant death when shot. The game always shows
how many points are missing before getting a better rank in the high score
list.