I dont really have any criticism beside that there isnt a whole lot of content. I dont have any knowledge on how long games take to make so im not going to complain on amount of time it takes to add new content. However it would be good to see some more interaction like customization or more visual scenes but im sure you're planning to add those anyway.
I think it would also be good to see an expansion on the game as well because I kind of went through the game in a relatively short time. A bit like what Ford239 said. But beside that I like the characters appearances and most of the dialogue.
PS. A hint system might be of use when trying to figure out what to do for different endings. Might just be my problem though.