Spoiler for Episode 1 + 2:
Yep, I had the same impressions. Michiru's instant-member status was next to the opening scene the first I noticed. I can't really remember if the opening scene (before the intro song started) was actually in the VN because the whole incident would be heavily linked to Michiru's route as otherwise the name Kana was never mentioned
iirc.
And the scene where Satsuki cheered him up to join the election had to be also on her route, I think as at least Isara and Chisato were the one who did that part on their routes. Maybe Michiru as well.
The last thing I noticed was in the opening movie was a scene where Chisato hugged Yuki in tears. At first I thought this would be from her route, but after thinking about it again, there were on each route scenes where Chisato cried after Yuki confessed he's in love wih another girl.
There were also a few parts where Michiru said color names. I'd like to see that the anime will - at least shortly - explain the "deeper" meaning of it.
As for "final girl": I still prefer Chisato because it had been painfully sad to have seen her heart-broken on the other routes
. But, I wouldn't complain or rage if Satsuki is the final choice.
Generally, one of my main reasons to enojy the anime is because it's the closest to a VN-translation I can get and I don't feel like replaying the VN at the moment