Hey it's okay, seriously don't worry about it, there's nothing to apologize for. There's definitely something there using this concept. I really like the idea that your actions in the past affect what happens in the future and that there's multiple outcomes to different situations. I just wasn't sure exactly what certain things did and what changes I was making.
I would say if you wanted to continue building off this concept, give the player more tools to mess around with and see how that affects the future. Maybe if the player focuses on collecting wood, the island sinks but you build a raft to live out the rest of your days. Maybe if you murder everyone, the island doesn't sink but now you live in solitude forever. Maybe if you talk to and recruit everyone you can band together and escape the island somehow, just to spitball some ideas.
Like I said, there's a really good idea here. I just wasn't sure exactly what certain things did or what my overall goal was, but even then, that can also be player driven. Maybe the player wants to murder everyone and live in solitude, or maybe the player is more resource driven and wants to build a raft, etc. Don't apologize for or discredit anything you make. Taking steps forward towards making something you enjoy or taking time to learn something new is always a good thing.