I'm Making a Game!S

I have recently allied with a programmer (who I can not currently name, but you might know some of his work of which I will also not currently name) and we are using the same engine as the game shown above (not by the programmer I will be working with but still) to develop a video game for a platform many of you own! How vague! I can't go into specifics, but I just felt like sharing. I hope you guys like robots. So here is a question: What is your favorite/most often played mobile action game and what is your least favorite mobile action game and why? (It can be like a sentence)