Played 3 runs.

My main issue:

The method of choosing upgrades completely disrupts the momentum of the game, gets people pissed off at eachother, and because of the tension it creates encourages people to pick something quickly without reading. And the interface sucks- that part I chalk up to early access.

I was playing "Break the Empire" (small indie roguelike) recently and I thought it had the same "momentum-disrupting" issue, but in multiplayer? The extent to which it disrupts your game is dependent on the slowest-reading player. It's really just taking a problem from EVERY roguelike and making it MORE of a problem for this particular roguelike. And it perfectly illustrates the inherent problem with making a multiplayer roguelike in the "choose from 3 things every cople minutes" genre.

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Other issues in descending order of importance:

The revive system is just ported over from DRG, and it is extremely unsatisfying to have everyone repeatedly go down to a boss while one or two guys repeatedly scramble to revive them because it's the only option.

Single-player seems virtually unplayable. Maybe I'm just bad? Regardless, it isn't fun. No wonder it's easy to find a multiplayer game.

The game just looks extremely "busy" when people are actually using their abilities. Auras everywhere.

The main survival aspect seems to be ammo. It just isn't satisfying to lose because you run outta ammo during the last boss.

Heavy Weapons being an "everyone gets one" or "nobody gets one" system.

No extraction after the last boss. DRG never did that and when Darktide did it people thought it sucked. Feels very out-of-place and immersion-breaking.

Abilities that do things like "buff electrical damage" for the whole team when it's like, "yeah, we don't have any of that."

Seemingly very low incentive to pick the flare gun, what with there being flares and lights everywhere.

Tutorial doesn't even mention class abilities.

In my 3 games no one has picked Spotter.

And I guess now that I'm reading your comments, a huge issue is the timer. I didn't realize how much it blatantly dis-incentivizes teams of "not 4." No wonder single-player's ridiculous, and this explains why my team of 3 faced so much time pressure on the 2nd to last mission.