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Its a pretty good game, but i think the game starts to much difficult, in the first level you start fighting with lots of very little enemies, its kinda of sucks since the player don't have yet the basic skill for this game to be able to kill then, making you very dependable of the power-ups making a very bad first impression of the game.
It should start with some big and weak enemies so the player could get used to the controls.
Also wen holding space the aim should slow down a lot, so if the player wanted to give a good aim, it just had to hold it.