It's true that you can miss a lot of things if you're rushing, but my sister and I tried to be thorough--we both played through at least once, we tried giving the sphere to different people, but though we used a walkthrough we never did quite seem to hit 100%--I think I was stuck at either 98 or 99%. I don't remember where I got Episode Complete, either. (It probably doesn't help that I eventually read the script/watched video for most events I did miss, so in some cases I can't tell if I remember it 'cause I saw it or 'cause I played it XD;;;;.) While I found the game fun to play, I wasn't really impressed by the story or characters, but I wouldn't say it was terrible, either.

Did like that they let you get a glorified game over though. Yay for Vegnagun blowing up everything!