So i finished the B dungeon (syntech whatchacallit) and got the oracle.
What now? I did the oracle side mission (THANK GOD for stealth not consuming stamina anymore) and now i'm not quite sure what to do, oracle tells me "just do whatever man" or something. Is that the end of the demo?

I'm 80% sure that's the extent of the demo (So-far) for the first area regarding *direct progression* if I'm not mistaken. 

That's pretty much it assuming you've done all of the delves.