The Leishman pieces I've seen so far are of a promising type: linear narrative playing out in an interactive environment where exploration is rewarded with additional depth. As Red Riding Hood walks to her Grandmother's house, you can click in her basket to read her diary... but you don't need to. In The Bloody Chamber, clicking on buildings in a cityscape sets them to walking around in an unnerving manner that sets the mood well. You can watch it like a movie if you want, but interacting with it will be rewarded.
Kate Stables wrote in the Guardian Online: Leishman strikes just the right balance between plot and charming distractions, packing enough secret scenes under the skin of her story to make a repeat viewing a must. I watched each of Leishman's pieces several times, and the feeling was like playing a good video game. I worked through the main narrative once, but then when I realized that there were easter eggs available, I started 'playing' through the stories again, looking for mouseovers, guessing at where I might find detail... I wound up engaging the setting of the story as more than background, as a place to read more... as a setting.
This seems like a development on one of the genres that hypertext has always done well, the mysterious environment. Red Riding Hood is Myst-esque, but with the narrative brought to the fore and set on a more demanding and prominent timeline. It seems like a useful development... the timeline can carry you along if you get stuck
Brainstorming, now: this works like DVDs, in a way. DVDs coming out now always have extra features. Some of the extras are material within the story, many of the extras are about the making of the movie or its setting in the rest of the world. Sometimes you have audio tracks where you can follow the movie but get only the actors' or director's comments as a form of "secret scenes under the skin" of every scene. Either way, you've got a narrative happening on several levels and the work encourages repeat viewings at various levels.