This is all just subjective feedback and based on an opinion, please read it as such.
The good:
It is a good game. Gameplay is fine. The concept works. Music is outstanding. Artwork in level design is one of the best approaches to 40k in my opinion. The theme of chaos and the inquisition is well presented compared to other games. Some scenarios have an immersive quality to them, which I appreciate. This whole idea of having automated chats between the characters works for me. Endgame has a lot to offer by exploring different playstyles and leveling up weapons. Balancing is overall acceptable, with veterans and psykers feeling a bit underwhelming to play or to team up with. I like the monetization concept with an affordable base price and lots of expensive skins. Overall I am happy to support the company.
The questionable:
I do not really resonate with this design choice to simply flood the screen with monsters. There is something about 10 crushers moving like a train that takes me out of the game. Immersion is important for my fun with a game and it is hard to feel, if the visibility is 50cm on my screen during the engagement.
Instead of spawning 30 more mutants and making this an arcade style jump and run game, harder bosses and enemies would be appreciated. Fat Shark could make theirs lives very easy by simply increasing the attack and move speed of the end game enemies to enforce teamplay and to challenge players.
Thanks for reading and have fun in the game.