My only two problems with Kana, beyond a few suspect lines in the translation, both involved the “happy” ending.
[spoiler]First, it seemed to be doled out too whimsically for my tastes: if you take Kana to an amusement park, you get a miracle; if you take her to the library, you get shafted. Where is the order or meaning in that? Certainly, Kana’s life was constrained by her illness, but all of our lives are time-limited; we all will eventually die, and any of us could die tomorrow. Does the author really mean to imply that a life of leisure is more virtuous and deserving of a miracle than one of study?
Second, it detracted from the “thrust” of the game otherwise, which was clearly about surviving (and in some cases thriving after) a devastating event, rather than emerging victorious over it. The truth, as much as it may pain us, is that we cannot dodge the fate encoded in our genes.
Although I definitely see Kana as the better game overall, I preferred Figures of Happiness’s handling of a similarly unlikely “happy” Minamo ending, by sequestering it from the rest of the story (similar to Crescendo’s Miyu storyline) and casting it as a nearly impossible triumph of subconscious, preternaturally aware free will over fate, rather than just whimsy.[/spoiler]
(subsequently edited for clarity)