Nice to see a game with touchscreen support, and i love what you did with the frame, making it look like I'm playing it on an actual Gameboy!
The game itself is just a wee bit confusing; i can't seem to hurt anyone? I get that when I get hit I am transformed into one of my enemies, and that's a kinda cool mechanic!
Also, the art style seems to be pulling in different directions at the same time, like, the background and foreground objects feel mismatched, or mishmashed.
I feel that maybe the experience of Extinction could have been helped by an info screen of some description.