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As far as addictive Geometry Wars-style twin-stick shooters are concerned, you could do a hell of a lot worse than Tachyon Project. There's a good few hours of frantic blasting fun to be had here, and while it doesn't have the replayability or overall appeal of Geo Wars (it's hard not to keep drawing the comparison), Tachyon Project does have a lot of its own merits that make it worth checking out.