Before anything else it is a work of art, however good or bad is for you to judge for yourself.
Secondly it is a story and an experience. The fact that you are nudging a character forward with interaction (however small or large) makes it a game. But placing any expectations on it strictly as a game runs you the risk of missing the intent of the two man creative team (three including the man who does the soundtrack).
And btw that's two people working on this with a very small budget, hence part of the reason for the long development time.
When I go to a museum and look at a painting, I don't give it a number score or note how long it took me to "experience" it. I suggest that you enter Kentucky Route Zero with the same thinking. That thinking should also apply to your choice of playing the chapters now or at a later time. Each act stands as it's own small experience in a greater world rather than chapters of an incomplete book.
If all this appeals to you then enter Kentucky Route Zero at once. If it doesn't then you shouldn't.
That pixel creature she's fucking, what's the name of that creature from the William Burroughs stories? A Mugwump? Yeah, that thing, it looks like she's fucking a Mugwump.
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