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You are under attack by aliens. Aliens are coming out of portals to earth and you must destroy them. You travel to their homeworld and begin to destroy portals. Aliens are not happy about this. 8 levels and 2 bosses.
W=UP
A=LEFT
S=DOWN
D=RIGHT
ARROW KEYS
LEFT MOUSE=SHOOT
RIGHT MOUSE=AUTO SHOOT
CHEATS IF BORED
B=PREVIOUS LEVEL
N=NEXT LEVEL
By the way, those flashing barriers in levels 1 and 2 are destroyed by touching them.