Interesting idea, but there's a long way ahead to make it to a full game.
It feels like it lacks something at the start, to keep the player engaged. I walked around for a few minutes before finding the raft, and the slimes are just annoying. Maybe add some more features like drops from the enemies and loot spread in the map
I got stranded in the island on the map to the right after the sword,. I went up in the map and found nothing, so I returned and when I touched the island I couldn't hop on the raft anymore. I think that area shouldn't be accessible, right?