Ok so i gave this game a go but the mechanics are definitely difficult.
I havent figured out how to beat the first mini boss - seems to be v high level. I suggest the tutorial include what you should by in the first round and get a general feel of the game.
I tried min maxing 2 cadets with side arms, that got wiped.
fighter with armor sidearm and sheild - got wiped
heavy with armor and primary - go wiped.
Not exactly sure what the combination is to get past the first boss.
It's also not clear to me if you can retreat or not? - not sure how the end day works while you are on the expedition. I'm guessing you cannot return unless you beat the boss.
May try this game again when its more flushed out.