The game tends to rapidly increase in difficulty as you progress to the next biom. This means that you will have a similar experience when moving to other areas in the future, not just swamps.

New enemies don't know how to fight against them. Some enemies have to be pulled out, some have to be blocked with a shield, and some have to be attacked first. So it takes time to get used to it.

Therefore, if you are inexperienced in this game, it is best to draw enemies from a safe area, learn some combat patterns, and faithfully replenish your equipment.

Don't go out at night until your gear is full. This game is a game with huge enemy spawn at night.

If you see a spawner, run away from it and go back. Big-size enemies in each area, beware of mini-bosses (like trolls. I won't mention other enemies by name because of spoilers).

Above all else, eat well. This game is a really powerful game with food.

Like Dark Souls, once you've gained some experience, all your enemies will look too slow and weak.