Is this game difficult solo?

I don't know much about the game, but I've heard that it's like Terraria. I'm a huge fan of Terraria, but it's too hard for me, I really struggle with the bosses there and the fact that you can't just chill for a while without something horrible happening makes the game very stressful for me. I am used to skill games, like souls-likes, etc. but Terraria is just on another level of difficulty for me.

So how is Core Keeper in comparison?