Sooo impressions.
General stuff:
I like the OP a lot. Not so much the song itself as the fact that FINALLY a bit of respite from generic anime Jrock and Jpop opening songs. It's nice, relaxing, fits the atmosphere of the show well. Thumbs up.
The animation is that peculiar combination of simplified and ridiculously detailed which I find very appealing for some reason. The locations are drawn beautifully and the character design says it all without too many lines. Again the dreamlike atmosphere of the show (so far) reflects nicely in the animation.
I really like Ginko so far, and the few secondaries that appeared so far are pretty well done (especially the grandma imo).
All in all I like this show so far, although the next episode is the fatal 3. that makes or breaks my interest in a show, usually. I have high hopes for this, though.