is this worth gettin though>?

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you had a bad day once, too. huh?

if you like space shooters...yes.

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Zombies everywhere, zombies everywhere, zombies everywhere. They're coming for your brains and it's too late to change.

The game changes a fair bit compared to the demo.  The levels involve a lot more combat with much tougher enemies and the difficulty jumps up very quickly.  You really have to learn controlling the ship, the new weapons, and the reflect shot whereas in the demo you can pretty much fly at everything and survive.