As a veteran of other games such as Terraria, V Rising, etc, I've just one-shot most of the bosses. With good food buffs, good gear, etc, the bosses just melt. I died once on the Core Commander partially because I let my buffs run out after killing all the hydra bosses in one buff duration, so I went on to CK without caring too much about that. I assumed I'd at least have *some* trouble killing them. The Lava Slime gave me a little bit of trouble, I guess.
I went into this game blind on hard mode with a melee build since I figured that would be the biggest challenge. But so far, I usually only die if I get careless while exploring.
V Rising does this better IMO, even with optimized gear and buffs, the bosses take minutes to down in each phase, and taking a hit or two is usually quite lethal. In that game I could spend days on some bosses. Mostly the final bosses, but still.
I guess I'll start doing the bosses without the best buffs, but still, is this game way too easy if you know how to buff?