Very ambitious project! You definitely accomplished a lot more than I would have been able to with this idea.
However, it's not very original. As well, there doesn't seem to be much to do in the game. I would expect it to focus on exploration but there weren't many interesting things to find. It's difficult and time consuming to reach other islands, and there isn't much point to doing that in the first place. There was an annoying bug where after I died, pressing play would only bring me to the "you died" screen again.
Still, ou did a surprising ammount with the limited tools you used.
Also, (not really a complaint) opening this game gives me a warning that it could be dangerous. I'm not sure if there's a way for you to fix that.