Argh! <bleep>ing <bleep>ers!
You have a spaceship, a handful of crew and a really hostile galaxy, topped off with a seriously unreasonable request to go fight a final boss.
Prepare to get eaten by mantises, suffocated, burnt, blown up or just plain run out of gas.
Or eaten by space spiders, killed in riots, killed by disease......

Fun little puzzler, but oh so short.

Singleplayer doesn't really vary that much during the campaign, and you'll mostly just shoot tons of orks in varying environments. That said, this is the first 40k game where a bolter has FELT right. Bam! Kabam! Feel His wrath, xenos filth!