The app seems to run well in that it doesn't crash on me or have any bugs. But, and I've only done the knowledge based section so far, some of the trivia questions repeat a lot. Also, it'll jump from super easy to super hard in the same level.
I'm also confused about the number of lives. Do they rollover through out the rest of the sections once they become available, or do I get additional lives? Why do I even have lives? I paid a decent amount for the experience, I think unlimited lives for the app would be nice. Can I get more when if I run out? It's not clear at all.