I've been playing this game Dead Trigger 2 on my new tablet, and I like the format of the game. This is the concept piece I put, will need to work more on the style with my own artwork. It will be based in Eastern Europe (just went there last week) and be a little rough with graffiti and stuff. I'm trying to go for realistic graphics, sort of like a Mirror's Edge thing.
I think there is too much competition on desktop with AAA studios, but I feel I could compete better on mobile. So I think I will go ahead with the parkour action game and make it for mobile.