This short game was deservedly lauded on its appearance. Lost Pig seems to start off as a concept piece: Grunk is an orc and communicates as such. But as it progresses, it becomes more than this. Grunk starts to function as a Candide-like observer of a small and seemingly static world: the distance induced by his vocabulary eventually vanishes and the player ends up identifying with Grunk. This is an impressive feat.
It can only work because the game as a whole has an internal structure that is unusually coherent and whose logic meshes with Grunk's ability. The NPC is a gem: quite different from Grunk, but complementary. By the end, the player is urging both NPC and Grunk on as they bring the game to a conclusion.
There have been discussions about the place of Lost Pig in the pantheon of contemporary IF. Without entering that debate, I would argue that Grunk is (written as) one of the most memorable IF characters, one who is transparent and who ends up being, in his own small way, a hero. The pig is a tremendous character, too.