This is a kind of shooting game.
You are a brown combat. By swiping the screen, it moves around. There are two types of enemies, white combats and fixed batteries. By destroying an enemy, you get 1 score.
By collecting a coin, (which often comes after you destroy a white combat), you get 10 scores as a bonus.
By collecting a red cross, (which often comes after destroying a fixed battery) you gain 1 life. You have 20 lives and 180 seconds. Get as many score as you can. The score is shown at upper right corner.
I wrote a blog about my game development.
If you are interested in how I created this game, please read my blog, as well.