Double D. F.

You are given control over a spaceship, equipped with a Dark Drive. To make the things that happen in dark space comprehensible for the human mind, scientist have managed to simply the control. They designed an interface that will let you interpret flying through dark space, like it is just a colorful vertical scrolling shoot'em up.

In this game you:

will encounter dozens of different enemies, all with their own behavior

have to fight a boss at every the end of every second level

choose upgrades to help you survive each level