Write an Android game (simple & keep it easy)

I`m looking forward to create a 2D game something like an arcade game. Basically, It`s about numbers game (odd & even), (randomly generated numbers)each number will be moving in front & getting nearer to screen & player has to tap on it depending on the mode of the game. Also the difficulties will be increased by combining the random numbers with colors & also there will be time limits for higher level of the game.