Let's start saying that it is not really clear what is the purpose of this app.
Is it just a game? It has a real educational intent or just an informative one?
Obviously it is meant to support ESA Swarm mission but let's go through the details to get a better understanding.
One of the main feauture of this product is a direct access to the #Swarmcampaign blog and socials even though it is not clear why the user needs an app for that. You can have an easy access to ESA blogs and socials from any device, included the one that you are playing with!
The main idea behind that choice seems to be an "all in one product" : a game (you control a steel ball across a labyrinth by heading at the compass needle), all the available information about #swarmcampaign in a click and a very nice layout feature (not immediately graspable) about getting an idea of scaled-dimensions and position of the satellites relative to the Earth's inner structure.
What about the game? Can you handle true north? Try it! It will take you a few minutes to figure out how. But, what comes next? Is that it?
Another non-trivial issue and not for the sake of criticism by itself is the overall aestethics. The app, at a first glance, lacks of beauty.
Of course any product in the end is a compromise (costs, oppotunities, tools availability). No contest on that. We'll see, in the near future, if the users enjoy it and their reviews.
As for us, what is surprising is that this app have been released by this time, while, given the huge potential of our technological capabilities, a big shift is happening in education and science dissemination.