Lots of lag and latency issues with client crashes and Ping reaching into the hundreds.

Numerous bugs such as spikes falling outside of player reach, Retrodes not having a chance to spawn spikes, odd levels being given the Spike storm effect (Shrine of Slumber? why? it's a slime level), other levels weirdly not receiving it (odd that Deconstruction zones are Spiked but not Gremlin Grounds), some respawners like Totems in danger rooms allowing for infinite spikes due to monster respawns via skull rebirth (at least you got the respawn pads done right).

Not to mention various other balance issues such as monster speed not capping at a workable limit, spikes giving priority to monsters over player pickup, some spikes spawning directly on a monster not giving the player time to try to snatch it.

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And all of this half baked event for a Normal damage gun as a 10 year late apology for putting exclusive content in prize boxes.

Just one gun.... no sword, no bomb, no armor, no shield, no sprite reskin.... just one gun....

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And honestly all of this could have been avoided if you really ACTUALLY did good testing... instead you just opened a private server for the people who spent money on the game... and granted, I understand, they're likely your most dedicated players.

But any information you get from them is going to be very VERY skewed towards the experience of endgame players who dump tons of cash into the game for hyper-optimized gear. You yourself as devs are also unreliable as testers, no offense, but you need some way to get the opinions of the average casual players.

Next time you open the test server for stuff like this you need to restrict your testers. Limit their armor, weapons, etc. You want to put your testers in the shoes of various lower ranked players from Champion to Recruit... If you ship an event that's a tough challenge for a Vanguard ranked whale, then you need to make sure it's still fair for the casual players who are still working their way up.