The demo experience is just a taste of the final app, and only includes a couple of pronunciation training exercises and 8 words worth of content.
The final app will have much, much more: 625 base words with 1875 sentences, around 35-55 pronunciation lessons per language, an ever-expanding community database of sentences, and the ability to add your own content.
If you're playing with the demo and you'd like to explore some of the options you missed (because you indicated you were a beginner in Spanish, or you marked all the words as 'known'), then hit the "?" button in the top right and reset the app. Then try the demo all over again!