What I like about Planetarian is how simple it is while at the same time deep and complex. It is very unlike any of Key’s other works (maybe because no Maeda? I have to say, as genius as he is, if this is how all Key’s works would be without him, it wouldn’t be so bad).
The world it is set in is HUGE, and I would love to see much more of it. Especially with the inconclusive end, which was actually kind of nice for a change (like @mechgamer123 said, no Key magic). The story was “over”, but there was so much about the world left unknown. Lots of post-apocalyptic settings have been showing up lately, but rarely do they feel so dark and lonely. I think the mystery behind the war, the machines, the junkers, and the rain really just pull you in, which allows the story to be as short as it is.
I’m really glad Sekai Project picked this up. Its short enough, emotional enough, and un-VN-like enough to surely get some new people into it as long as it sells well enough.