There will be yes. There are a ton of bosses in catacombs etc but the main ones will block your progress but even then there will be other places to go. It’s not as locked in as other From games.This game is so good, just exploring Limgrave and found some really cool stuff and some caves, found a nice Greatsword in a chest
So far it seems bosses are optional? I have downed one in the Catacombs, but afterwards I felt like I didnt really need to do it like say in Demon Souls where you had to beat one to progress, i'm assuming there will be bosses that you have to beat in order to progress?