I've played a fair bit of it,
It's a co-op pveve extraction shooter, where shooting is very often the worst option.
I've played it off and on pretty much since release. The most recent I played it was late last year with a friend, so the following opinions may be slightly dated:
When it's good, it's a tense and memorable, almost voyueristic experience where just managing to traverse a single obstacle or bring home a bag full of scrap can feel like a victory.
When it's bad, it's a lot of grind with lots of early access bugginess
Definitely a spectacle, sometimes horrifying, sometimes beautiful, (sometimes silly)

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(Also I have several railguns assembled and can never find enough friends playing at once to actually get use out of them, everyone is welcome to message me here or on discord, if they need a +1, (with or without railgun parts))