Thanks for the welcomes, everybody.
If four different people so far are recommending it, I guess I really should play it. Hoshizora no Memoria will probably come after Little Busters!, which is next on my list to play, so yeah.
Thanks for the moe.
I'm less playing them in parallel and more playing just playing one at a time for a while before switching to another one. I kind of get lazy with 100% visual novels, it seems (or just don't like them that much, in Shuffle!'s case).
Yeah, I've loved pretty much every Key Novel I've played, and I really don't see that changing for the others, except for possibly Air as its anime disappointed me somewhat.
So far, I don't know if I have a clear favorite route, although if I have to name frontrunners it would be Makoto and Shiori. Not entirely sure why right now, but it's probably got something to do with how strongly they managed to make me feel. Nayuki's was fine as well, but I just didn't get the same feeling from hers as I did the other two's. I'm nearing the end of Mai's route as we speak, so I'll report what I feel about that one when I fully finish it.