Your game was fun, but here are the things I would improve:
- The Ending was very abrupt, I would have liked to see the raft built and then have to walk onto it to begin the ending cutscene.
- I would have liked to see a progress bar above the raft showing you how close you were to finishing it. Having just 3 stages on the 3D model of the raft simply isn't enough. If you could see a percentage or even just a filled-in bar of how far in you are, it would make the gameplay slightly more exciting and give more "hope" to the player that they will be off the island soon.
- The player model animations are very weird when you're walking in any direction other than forwards. If you could make it so the character faces the direction their walking, that would make this game a lot better.
Besides these, I actually really enjoyed your game, and I think it (and you) have a lot of potential to make even bigger, better games!