I develop apps for both ios and android. Usually I make them native or in Unity3D.
Apps can also be made in cross platform frameworks or in a responsive html web page.
Some years ago I made games in Unity and I was participating in Nordic Game Jam.
It was fun to develop the games, but the competition showed to be very tough.
I prefer to make 2d-games but it is just as easy to make 3d games with Unity.
View this Unity video to see some of the features of the platform.