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After getting all the upgrades it becomes too easy. With no further increase in difficulty the high score is just determined by the player's determination to keep doing the same thing over and over, which kinda sucks. If the difficulty steadily kept increasing then at least you could see how long you last, giving the high score some meaning.
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too easy! in a while i had all the upgrades and was leaving the screen totally clean -.-U
There was no boss, which is boring,
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Sweet. Too easy with fully upgraded ship (i just killed myself cause i was just mowing them down). And only 3 kinds of enemies. Good job though.