If you enjoy Spaceflight, aerospace, and aviation, this app is definitely for you! It is a great companion the their other game SimplePlanes and adds a fantastic new dynamic. Similar to KSP but is much more customisable. You are able to make extremely detailed crafts that both look and fly like the real thing.
Some improvements that could be made would be to have a little more interesting terrain on at least the main planet of Droo (a small area like in SimplePlanes would be great). Adding some of the parts from SimplePlanes would also be great, such as the hollow fuselages, engines, magnets, winches, and air breaks. Having a way to easily recenter your view while in cockpit mode would be great too.
All in all, a definite 5/5 stars from me! Looking forward to what comes in the future!