how much should i ask per hour?

I have been programmin games for the past two years working with different engines (unreal, cocos2d, panda.js libgdx) also i develop android native and xcode.

Im getting tired of working for the same guys and i would like to also start working freelance... it seems i cant get enouhg of this sh1t haha.

How much do you think a game developer shoud ask per hour?

Please share your experience.