Yet one "big" addition to the game engine (engines are never finished anyway...) is ability to swim. Previously our unnamed hero was just able to walk into the water and when far enough from land, he just drowned.
Well, now he can swim even quite long distances. But swimming obviously consumes energy much more than regular walking, so the player really must consider carefully when and where to swim. Also there might be piranhas or sharks in some water areas, so it's always a risk. With good luck and by clues found on the island, the player can discover new areas and mini islands by swimming.
Just take a look how fun it looks!
What's more, is that you can improve your swimming ability for example by finding flippers and/or a snorkel. Then you have better chances to reach some new areas.
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MJK 
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