Nice game, just enough challenging. And... every menu, every item, everywhere accessible without having to leave the keyboard! Most games with keyboard shortcuts limit those to the in-game controls, but once you finish a level, want to select another one or anything like that, you have to use that damn mouse that's never used anywhere else in the game. But not here, yeah! Good job, a solid 5/5.
Is it just me, or this game looks a lot like Titan Attacks!, from Puppy Games (http://www.puppygames.net/titan-attacks). The upgrade system, the "don't let anyone escape" reward vs. penalty, the enemies' patterns, even down to the color scheme... Nonetheless, it's real full and all, so 4/5.
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 "Particle Wars Extreme"){kind=icon}
 "Space Mutants FROM SPACE!"){kind=icon}