Totally agree! A good, bad and neutral ending for all the characters is a great idea! I'll even implement it into my visual novel whenever I get started on it...
Anyway, I wonder if the Echo writers ever see these comments?
To be a truly great author, you should take into account what others think. And I don't see a reason adding happy endings would really change what the story is about! Like Chase and Leo could get back together, but the town is ruined, Chases project is ruined and maybe he won't be friends with one or more of the others anymore? Actually in a "happy" Leo ending I think things won't turn out good for Flynn!