I remember hearing somewhere that during development the co-op would have had the player characters individually hallucinate at times. I wish that they were able to run with that, it would have been an interesting co-op experience.
overall the game itself isn't bad, but it doesn't come anywhere near Dead Space 1 and 2. It almost feels like an action horror game. Like, the setting is perfect for a sci-fi horror ala The Thing, but the execution doesn't leave you scared; on top of that, any sense of horror or dread is quashed when you find enough resources to build a mega-gun (which can be done easily through an exploit).
I fucking love the final chapter and boss though, It was different and planted seeds for a Dead Space 4 that could play with cosmic horror themes. It's a shame that we're never going to get that now.