its definitely not just you.. i just arrived in the plains with my friend and the difficulty increases are ridiculous especially cause all the armor you made before INCLUDING upgrades, is rendered useless.. enemies one shot you THROUGH my tower shield (serpent one) and even small enemies are a pain to block. wanna get your stuff back? good luck dodging mach 2 mosquitos that one shot you. its so tedious to upgrade armor, just to manage to survive the CURRENT biome you are in and be rendered useless basically the moment you enter another biome