I'll start by saying I enjoyed the game overall. As far as the "ending" goes however, it caught me off guard. I'm used to sort of never-ending, open-ended games (Sim City, Civilization, Age of Empires 3, etc.), but there seemed to be hints at more to come.
When I discovered (opened) the cave, the subtitle text and the accompanying visual scene depicting cave wall art really felt to me like an additional puzzle. Not only speaking of someone seeming to have been there recently because of the fresh bowl of fruit or whatever it was found in the cave (I did have a villager or two find and read a note and run off down a hidden path and disappear earlier in the game), but the cave art itself seemed to diagram how previous villagers found a way through the waterfall either to get off of the island, or to get to another part.
Aside from those teasers, I thought something more would have happened with the treasure - it's still sitting there. Of course, I guess they couldn't exactly take it anywhere and spend it. I had other thoughts/ideas, but I've got to get going, so I'll end it there for now. I hope I'm not touching on potential plot points for VV2, but I was wondering if anyone else had similar thoughts while playing.