Action game is very complex and minded genre, a peculiar quintessence of all other types of games since it requires a lot of efforts and skills. Nevertheless, it is not necessary to dread it. You only need to set some reasonable goals; good compromises can always be found. Don't try to develop something big; try to concentrate on a small but interesting project. 3D engines as well as 3D editors are pretty accessible now. It is possible to create simple models of characters and props yourself, especially if the graphic style is minimalistic. Always try to demonstrate the advantages of 3D geometry via game mechanics and story; the player should get maximum experience. There are some issues with controls on touchscreen devices in such types of games, but they can be resolved; you only have to turn on your creativity.
In the next chapter, we will try to expand the boundaries of mobile games, allowing them to interact with real-world objects. The next chapter is dedicated to mixed realities...