I agree that these are pretty limited. I taught a class on interactive narrative last year and I really wanted to have my students make something like Zork but

I agree that these are pretty limited. I taught a class on interactive narrative last year and I really wanted to have my students make something like Zork but there just isn't anything user friendly enough (The class had no per-requisites so I didn't want to assume the students had any technical knowledge and many didn't) so I chose twine. I was pretty happy with what they did because there was a really wide range of topics that aren't usually seen in gaming (one was making dinner, another was going to the mall, another was a text based football game. There were a number of games about more-traditional topics too).