AGS has an excellent subforum for comments and critique, but for something I think I may start soon, I'll need to look elsewhere. I've a story that I need to see if it makes logical sense to people, but I don't want to start blaring about it here on the AGS forum - after all, it'd ruin the twist to the people who are most likely to play it.
So, can anybody recommend other places for helpful advice on the content of stories? Something like fiction websites, for example.
Depends a lot on the game, I would say. What's the genre, setting, theme etc. - i.e. what "kind" of logic should they apply? Any kind of fantasy/sci-fi story would probably get more useful feedback in a forum dedicated to those genres (also in terms of unintentional cliches and such).
Also, taking into account that this is a game, I'm not sure a screenwriting or literature forum would be all that helpful. So my best suggestion would be to try the interactive fiction community. Lots of very smart people there, and while some of them probably also play AGS games, it's not as large a percentage as it would be here and you can put a spoiler warning at the top of your post.
Interactive Fiction Community Forum (http://www.intfiction.org/forum/)
Edit: Also, you could PM people on the AGS forum whose opinions you trust, or who've made games in a similar style to yours. Personally speaking I wouldn't mind having a game "spoiled" if my comments could help the developer - and possibly even enjoy the game more, albeit in a different way, by seeing how it evolved during production.
A long while back, an AGS member (tolworthy, maybe? I seem to remember the avatar being that cactus-obsessed Briton from "It's a Mad Mad Mad Mad World") posted about the starting of a writing website:
http://www.greatwriting.co.uk
Since then, it has grown a LOT bigger, has tutorials, events, competitions, and loads and loads of people ready to read and critique :D.
I'd be totally checking those links out Babar! Thankies!