Spark completely fulfilled it's premise to me. It's a neat beautiful product for cooperative storytelling in form of a very simple pen and paper role-playing game. It's written plain, simple, short but with short examples very easy to understand, and three settings to go that also engross the understanding of how it works and reveals the most fun and entertainment.

The great thing about it for me is, that it's a very good, quick yet helpful guide to boil the usual questions to all players what they want to play and experience down to a smooth story-weaving altogether with everyone participating. This way you can play any scenario you like with it, as long as you bring some spark of creativity. This game makes it really easy and fluid to create worlds, characters and most interesting stories with each other.

For the three offered settings it's all quite non-standard. I found the Japanese future colony setting the most compelling.