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Easy. Very easy. I beat the whole game without using shield and slowmotion. In fact, i learned about them after beating the game. But well... i loved it! You could add sound to minigun, and to enemy fire. That's be perfect. Game is not too short, and nice made. But that's all i'm afraid. There was no ending after all. Shame. But i liked it i dunno why. 4/5, 8/10.