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Ducking can be a useful way to avoid the hail of bullets coming in your direction.
Freeing the hostages will likely bag you a gun upgrade or some new bombs.
Don't be too worried if you turn into a mummy, for you can still find a potion and turn back.
Right before the battleship on the first level there should be a guy hanging above you. Shoot at him and he will help you.
Explore the galaxy in the franchise's first open-world game.