Intrusion is an awesome retro sidescrolling shooter.
Venture across 5 huge stages including mountains, snow, industrial buildings, and even moving trains.
Fight against a vast array of soldiers, aircraft, robots, and try to beat several epic bosses.
Comment your top score for Intrusion.

Move - WASD or Arrow Keys.
Shoot - Left Mouse Click.
Switch weapons - Num 1-4.
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