Thank you!
The theme of the Game Jam we created this for was "again and again", so the character is in a loop of survival and escape attempts. So, you're right there is no way to "win". The goal is to survive as long as possible and beat your last run. The team will try to implement a scoring system so there's a bigger purpose to building the raft.
Good job on getting to day 3! Did you get the rat event? They're sneaky little theifs. If you didn't get that event, let us know, we'll look into it.