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It's as important to dodge and weave as it is to shoot things, preserving your energy for the much tougher boss fights.
Don't be shy about shooting, sending out a blanket of bullets is a good way to keep the screen clear.
The weapons you unlock are deployable with a tap on the icons near the bottom of the screen. Useful if you're in a tight spot.
Explore the galaxy in the franchise's first open-world game.