Most of these comments are circa Act 1 V1. I DL'd it a few weeks after it was put up, but didn't really sign up on here until a few months after. I meant to post feedback here then, but a combination of my lurking habits + IRL stuff kept me from doing so. Probably gonna go through Act 1 V2 in a bit just for funsies.
Act 1 alone makes KS easily one of the best EVNs I've played. The way the paths intertwined and slowly branched off were excellent - the pace was slow enough to make the development of the characters' relationships seem natural, yet fast enough to not drag on. The way it's done makes Hisao seem like he's actually in a normal high school (in Japan), and not some harem where every heroine jumps at the mention of sex.
Each character, despite the small amount of time spent with them, is well defined, whether it be high class Lilly or nonsensical Rin. Fairly certain out of the 5 archetypes each heroine generally follows, there's something for everyone. Being the white knight I am, I love Hanako. She seems wonderfully moe. Everything from the slow dialogue to the sprite of her playing the lock of hair that goes over her scars is just so d'awww worthy. Though if it wasn't for that, I'm fairly certain my favorite girl would become a five way toss-up.
Speaking of that, the artists have done a very nice job. The CGs are all consistent in style, nicely detailed, and manage to capture the character. Lilly just sitting calmly in the tea room, Rin's quirky look on her face while she's eating, or even Emi rubbing her head, looking only slightly guilty at running someone over just works. When it comes to the sprites, I was disappointed because I thought Misha's chubbiness would be the norm. Yay at being proved wrong. Dem curves and all that.
Some general things I thought of on each route:
Emi: She just seems so normal compared to the rest of the cast. I'm thinking it's going to work out so she helps Hisao take advantage of his arrythmia or adapt to it or something. And loli. So much loli.
Lilly: Probably the most natural route when it comes to developing a relationship. All I can think of that was annoying was that cursed "I'm fine" option. Hisao freaking out was just unexpected. Her ending was stellar, especially with how it linked back to your first meeting, and with Hanako actually being included.
Rin: Hilarious. Radically different from everyone else's. I enjoyed how manages to remain inane and yet still appear intelligent. Dry humor is my favorite sort, making Rin great. Cant' wait to see how she progresses. Tho I'm curious as to how different her entire route is going to be, since you'll be in the art club with a larger cast.
Shizune: WAHAHAHA. Does Misha sign that to her? This route was probably the biggest in terms of actual... story? The only route that really makes it seem like Hisao is a big part of the festival, and definitely the most rewarding. She's the only girl that would stick with you from the start, though that may be because she's just lonely. Tsundere is probably the easiest way to describe her at the moment.
Overall, KS is a great work. Honestly, I have to say that playing this demo made me look at those with disabilities differently. Before, I just sort of stayed away from them due to the entire social stigma they had. Now, I think of 'em as just being normal people that need some help every now and then. I must say, this game seems really professional so far. I was surprised to find out that you're all just a bunch of normal people, and that you somehow produced something that could make so many people go gaga in just half a year. Hope the rest of the work goes on without any major problems.
My face when I played KS, but in a happier and less @_@ way: