Gynoug (EU)

From the Main Menu go into Options and then down to Cheats and enable all of the different options including Invincibility then start up the game and you can finish it with ease thanks to the cheats.

Make sure you're shooting the enemies so you can get the one million score achievement.

I recommend taping down your A button to keep shooting and you can just afk and get the full completion in around 45 minutes. :)

On the main menu go to options then cheats and enable all of the cheats, then start the game. You can hold down the A button on the controller with something I used a spare controller. Then just let the game play out, come back in 40-45 minutes and you will have 1000g.