Thanks, I'm glad you like it.
1. At the moment the Easter eggs are really just there for their own sake, but when the game's done I'll probably have a little post-credits scene sort of thing that unlocks if you've found them all (across all plays through, so you don't need to find them every time). I've done that kind of thing in the past.
2. Well, you might miss scenes that continue the story, yeah. You can keep playing past that for now, but I'd recommend maybe keeping a day 7 save. All that said, this game is going to be designed with replays in mind and some
very big changes to the story are going to happen once you start to get endings, so I wouldn't necessarily be afraid of coming back to it again.