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Controls
← → or A/D to move. Space, Z, X or Enter to fire. Click anywhere on the game to fire too.
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Enemies
Three types of aliens — grunts, soldiers and commanders. Each is worth more points.
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Bombs
Aliens drop bombs as they advance. Dodge them or you'll lose a life.
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Shields
Four shields protect you at the start of each wave. Both your bullets and enemy bombs erode them.
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Scoring
Grunt: 10pts · Soldier: 20pts · Commander: 40pts. Mystery ship scores 100–300pts.
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Waves
Each wave enemies move faster and drop more bombs. Survive as long as you can!