Doom and Warhammer 40K make a pretty good pairing. It has a nice retro aesthetic that does try to capture elements of the 40K which is cool. But the main issue is that, it gets a bit stale after a couple of hours. The enemies and environments start to feel repetitive after a bit. Even though the environment's may be 'new' they're structured pretty similar in their design. There's not much to explore, the secrets are temporary power ups either timed or just for that level and they tend to be just tucked somewhere rather than an exciting reward for exploring. Weapons also didn't feel very unique for the most part, didn't feel like it mattered what I used it was about as effective.

I like the idea behind this, it would be cool to see it expanded and some of the design kinks ironed out, tap into the larger roster of 40K races or lore. It is a game that ultimately is difficult to complete because it doesn't do much to keep your attention with fresh game design or story elements.