Island Survival game - Impressions?

I've been thinking up this idea for a game. It is a survival game set on a desert island.

Each of four players takes on the role of a castaway on this island. The game takes place over a few days during which players have to gather resources including fuel for their fire and food for energy with the goal of getting off the island by any means: Building a big enough smoke signal, building a radio to call for help, building a raft, message in a bottle... Each of these holds a different probability of attracting help or providing salvation. I think I have a cool idea for how this will work!

They also discover unique items that often have one off uses or can be combined with other items to create special items. eg, a flash light might be useful only as a make shift weapon on it's own, but combined with batteries it becomes very useful at night time.

So the island is 9 modular tiles laid out in a square. Each tile is split into a grid of 5x5 squares. Every tile has a unique characteristic and name, eg. Pirates Cove or Smugglers Bay (cliche I know, just examples.)

Each player chooses from one of six characters. Each of these starts with one or two items of their own to give them a distinct play style, and varying stats. Every player has an Energy level, Strength value and an Agility value. So one Character is a big brute, with a high strength, but low agility etc. On top of that every character has a unique ability like spending half the energy to travel further...

On certain tiles are one or more "Explore" icons displaying a number. These numbers each refer to an off board deck of item cards. When players reach an Explore icon they can search through the deck of cards numbered to match that spot on the board. Seeing as players can only carry a few things at a time they might also leave a few things behind to lighten their load, with the intention of returning to collect them later. Of course if another player beats him to it...

Basic resources like wood and stone can be collected from anywhere with the right terrain on the island if the player has the right tools. (axe for wood from trees etc.)

As these characters spend their turns travelling around the map day slowly turns to night by means of the time dial. When night falls players make sure their fires are stocked with wood and they are in the protection of it's glow because all sorts of creepy monsters roam the island at night.

At night everyone draws from the monster deck - a deck of cards detailing different monsters and their strength and agility values, and their spawn point. Then each player spawns their monster on the board at the right spot and take control of it to hunt down the other players. They have a combat penalty in the light so players who stay by their fireside are safer, but those who venture out to collect fuel etc. are at risk.

As the game goes by Event cards are drawn. These could be avalanches - blocking off parts of the island, or crates washing up on the island full of unique and sort after items.

I think the coolest part of the game will be the social aspect. Players can form alliances and go for a team victory but risk betrayal, or they might go it alone. Some events might require team work to undo their effects, like an avalanche may cover one of the Explore icons in a large boulder which can only be removed with the strength of four people... Stuff like that.

When players do meet up on the map, they can trade and negotiate as they please. The may even enter combat with one another. I have what I think is a really fun, simple and thematic real time card combat system for this.

My thoughts right now are that players can't die until the last day or so, rather only be paralyzed by hunger or exhaustion. But after that players can die of hunger or exhaustion or in battle or whatever leading to a last man standing victory at times I guess.

Thanks for reading, I'd love to know what you think, good or bad.