Fully rewriting my review at this point now that I've sunk a lot more time into it and the devs have ironed out all the server limit issues.
This game is genuinely awesome. 40 dollars for a PVE experience that can be filled with absolute laughs amongst friends or incredible moments that make you feel like Super Earth's strongest soldier.
The multiple difficulty tiers feel reasonably balanced as a whole, the multiple tiers might seem initially off-putting but it allows for players to fine-tune the level of difficulty they want from the game without having it feel too hard or too easy.
Progression is formatted like a battle pass system which might seem initially off-putting but the devs have stated that all passes are permanent, and the free pass has 3 times the content of the first premium pass and a majority of it is really good for late-game content. Not only that, the pass gives you plenty of premium currency to buy armor from the shop or save up and buy the premium pass, so the game doesn't feel pay to win.
The only major complaint I'd have with this game is it's weapon balancing. A few weapons in the game will be used exclusively into the endgame, but the disparity between the good and bad weapons is so huge its not even funny. If a weapon its bad, its unusable even on lower-difficulties with how unsatisfying they feel. The game needs a balance wave to boost other weapons to the same level as the weapons that are good, hopefully without nerfing any of the good weapons. Armor also needs to be properly fixed and working, but the developers are aware of that as of this review's writing.