Today, the most successful games are action games like FPS, RPG, MMORPG...

I'd like to make peaceful game, but I don't know how to attract people. I can make good graphics, but that's not the main thing that makes people like game more that couple of minutes. The content is important. In game styles mentioned in beginning are main content fight, kill others, make from yourself predator/the most powerful creature/player in the game.

But what content can attract people in peaceful game?