For those who might've mistaken that this is the demo and not a full game, you probably think that the moment you received dev's letter "The Game Continues..." is the part where the game is over.
No. All you need to do is to go to the boat behind the NPC that gives you that letter. You will be teleported to the mainland. From there... enjoy the (early access) full game content.
No. This is a full game. It's just that the requirement to get out from tutorial island is a little too tedious. You need to actively hail and prompt to the NPCs as they don't have quest markers and interactable buttons like the real MMORPG dev tried to simulate.
No. All you need to do is to go to the boat behind the NPC that gives you that letter. You will be teleported to the mainland. From there... enjoy the (early access) full game content.