Are you supposed to start at Lvl 20? And it is supposed to jump to Chapter 2 once you leave the area with tents at the very start? Also, you're supposedly alone because everyone left for the caves, but then everyone is in your party?
Yes indeed!
The game is very much in its early days of development.
The prologue and chapter 1 have not been added yet, so instead, you start off on chapter 2 at level 20.
The same goes with people being in your party. Our intentions are for you to be alone at this stage, but since this currently serves as the start of the game, we wanted to avoid early game frustration for people unfamiliar with the combat system and keep the party in there as a crutch for the player.