I think I left a few party members behind who I was supposed to pick up in Act 1. I don't have Wyll, the guy flew off the windmill and died.

I'm on the fence whether it's worth restarting. I might just play the game over again after I finish but that seems like a major commitment. Any advice?

Spoilers: I just got to the Inn in through the mist to give a reference for how far along I am.

Edit for clarity: I thought the windmill guy was a separate party member but it seems like that's not the case. Doesn't seem like I'm missing much by not having Wyll in the party so I'm thinking I'll keep going.