(spoiler)
Well, you may want to play the other routes to understand it better.
Flynn's route ends with him becoming the the monster! The picture shows whats left of his body after burning in the mine and traveling through time! The little kid in the picture is Jenna. She talks about seeing the monster in another route. As for Chase and the others, their not shown. I assumed they survived Echo maybe with some mental trauma and morn the death of Flynn. Carl and Dax saw Flynn burning in the mine, they would tell the others he's dead I guess.
Well, my soul is a frail, Echo is far more enough to me. xD Now somehow i understand, but i don't like i couldn't have a choice to get a good end with everybody surviving. :/ Ehh, this story is simply not my taste. The character design is really good, i would have enjoy some nsfw, but nevermind. The early story was really good, but the end was horrible for me. :/ Maybe that's just not my type, because how i see the things, everybody liked echo, now looks like i'm the black lamb. :D
Yeah, should have paid attention to the warning at the top of this page then!
Anyway Flynn's ending bothers me too, like there should be another option! Leo's ending too, I wish there was another option
