Are you kidding me?
This is nothing like any Warhammer 40k Ive ever played. The ultra marines are like paper dolls... Die too easily and the tyranids are overly powerful... Imagine in like the 4th chapter or something, you encounter like a carnifex that moves and attacks twice as much as your units could...
The emperor is apparently either a cheapskate or playing a money grabber with his ultra marines!
Evil_Jinius about
Warhammer 40,000: Deathwatch - Tyranid Invasion, v1.3