Yeah, the invisible barriers are just places that aren't in the game yet. They'll go somewhere soon.
The crash at Drake Soma-Sor is actually patched in version 3.0.1. If you download the most recent version here you should be able to fight him. Your save file will transfer with no issues. I fixed that about a day ago, but I didn't actually post a devlog about it.
okay, beat him.
Also beat the tomb of whatever with the trial.
seems like, except the boss fight in the village, I have more or less seen everything.
That would be about it. There's several sidequests at Deep City and Camp of Lost Hope, which you may or may not have seen. But those are more for completionist type people. You've done the bulk of what's in there so far.