Kino's Journey can pretty much be divided into two shows, one that is an entirely episodic travel anime with light philosophic content and a second that has a much stronger emphasis on philosophy and underlying whispers of a overreaching storyline. Kino's Journey: Life Goes On falls pretty solidly into the second category and does a good job of representing exactly what I liked about the main series.
Story 10: This is the story I wanted to hear since about episode 3 of the show, and it never disappointed. The plotline of "Life Goes On" does a wonderful job of showing how Kino's writers are able to seamlessly integrate Lain-style philosophy into a story without interfering with its pacing. That being said, it contains a similar level of spoilers as watching any prequel before the main series, I would certainly suggest watching the show first.
Art 9: Just about the same as Kino's Journey, along with the subtly annoying horizontal lines throughout. I really liked the darker moments of this OVA, the art in those parts were a very welcome supplement to the already established art style. And what can I say? I just love Kino's character design <3
Sound 9: I really enjoyed the voice-acting in the show and in this OVA it was maybe even better. Still don't really care for the OP or ED though, but neither are like gratingly bad. The BGM isn't spectacular or anything but contributes well to the pace and feel.
Character 10: A surprising amount of character development in this OVA, without messing up the series's, which was awesome to see. Also, many of the side-characters in "Life Goes On" were fairly unique, which was nice coming from a series where one of my few complaints was their reuse of stock characters.
Enjoyment 10: A very stellar OVA, if you liked Kino's Journey but always wanted to know more about Kino's past this is perfect for you. Even if that wasn't really the draw of the series for you, I personally believe some of the series's best moments are in this OVA so I'd check it out anyway.
Overall 10: If you didn't like Kino, this probably won't change your mind. If you liked Kino but didn't like its ending (as in- what ending?) this OVA could fix your opinion of the show, as it did mine. I find myself wishing this were the canonical last episode, because I fear some people will miss it. Please don't let yourself be one of those people! If you finished Kino's Journey promptly go watch this OVA.