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The magnet power up is worth having as it automatically draws out-of-reach coins nearer to you making them easier to collect.
The jetpack is the best power-up in the game to have as it enables you to fly around the stage with ease and shoot at enemies from above or the ground.
Always pick up the time clocks whenever possible because if you let your timer reach zero the aliens will automatically snatch you up and end your game.
If you press and hold down the 'fire' button when you attack you will be able to realease a continuous stream of ammo at the enemy.
Whenever you see warning signs marked with exclamation points appearing in the air it is to indicate that the immediate area you are in is about to be bombarded with lasers.