My mixed feelings towards GRIS are wholly because I wildly misinterpreted its plot. I think the intended message is pretty cliche but inoffensive.

Although, I don't want another game to steal its spectacular ending. This world and its ending are linked to one another; its conclusion would not have resonated so strongly if its story hadn't been so underwhelming.

Gameplay-wise, this is an oddity wherein I prefer the underwater sections. The world opens up a lot more thanks to this mechanic, it's executed perfectly, etc...