I'm still struggling mightily to wrap my thoughts - and feelings - around that ending.
OK, was anyone besides me thinking, "For God"s sake Riki, don't get in the van!"?
pulling everyone from the wreckage, lugging them up the hill on makeshift stretchers. I might have taken a few moments to call the authorities, and I'm still not quite clear on why Riki, Rin and Kyousuke weren't killed when they were so close to the bus (they even got the driver out, too) when it exploded. But generally speaking, it was all sensibly carried off.
wiped away Riki's tear before losing consciousness. Fundamentally, all shipping aside (though not at Comiket) that's the most important relationship in the series.
naked-universe Riki asks at the beginning of this episode - "is it worth it?" - the answer is a lot easier when the reality is what we got here than if it had been what we got at the end of episode 11. My answer would still have been "Yes" - it is worth it, because life is hope, and because even if they were gone the people who loved Riki wanted he and Rin to carry on and support each other. But making the question so much easier to answer robs the premise of some of its emotional power, at least for me.
playing innocently as children, smiling, laughing (though not the uncharacteristically thoughtful Masato, interestingly) and most importantly, all together. Kyousuke isn't weak and on crutches but his old, smiling self, stronger and more unstoppable than ever. If one were in a metaphysical frame of mind they could almost imagine that what we were seeing wasn't the real world at all, but in fact a sort of Heaven or dream - because surely, for these children, this is the Heaven they would wish for. I don't think that's how it was intended, but with Key you can never be sure. Perhaps the idea is that what we're seeing is whatever we bring to the seeing, and that whatever answer you arrive at, the ending is a happy one either way.
ED: “Little Jumper” by Rita