Annihilate all the Enemies and destroy devices within a limited time.
There is no time to waste, you should use your weapon to fight with the Enemy .

In game, you have to control the player to pass several levels within a limited time.
Death and time out means your challenge failed.i
But each time you dead, you will gain some rewards to improve yourself.

Also, item is very important, it can be divided into two categories:
Scene item (stage reward, up to five)
Status power up item (enemy drops)
Different choices of scene item will give you different experiences

Pay attention:
Enemies will continue to get stronger over time, So recommend you to plan your time well.