Spoilers
If it helps somewhat know that you’re not alone in this because I’ve felt the same way 
. In fact I was venting about it the other day in the read every day thread. It’s definitely harder than 9-nine- for me too, but at the same time I’m determined to struggle through it as much as it takes because I’m convinced it’s a great chance for improvement. I’m sure if we keep at it we’ll come out with a stronger grasp on the language, like @Daisoujou mentioned, so let’s keep working on it 
. Pushing the comfort zone sucks and it feels this bad, but at some point this will become our comfort zone and our level will be higher overall. Here’s hoping at least.
About the VN, I can’t say much that hasn’t been said already but I’ll add that so far I like it, I haven’t seen anything that I disliked so far, the music and art both seem pretty nice. I have mentioned in the reading thread that the font is a bit different to what I’m used to, so I’m reading a little slower just for that alone. For some reason my brain keeps reading Naomi’s (直未) name as 素直 over and over 
. I guess I see that word so much lately that when I see the kanji 直 in kun’yomi attached to another kanji my brain automatically goes すなお. It’s not even the same order, smh. It’s getting better though, good brain.
I’m guessing one of the participants of the game is the girl that detonated the bomb in the train. I’m also wondering, isn’t the girl that was nominated the same girl that was asking Rinka for directions at the cafe? So she was probably there to get info and not directions.
I’ll trust that the rules will become clearer as we go because yeah I also didn’t get them much. I might give them a re-read just to try to understand things better but in any case I’ll believe that they will be brought up in a simpler manner at some point soon, maybe when both Rinka and Miharu talk again. I’m guessing that things are not crystal clear for Rinka either and they will use that as anchor to inform the readers better.
I hadn’t noticed this but that’s such a great feature, thanks for bringing it up. I tend to forget details as time goes on so this will be really helpful to have.