Not bad. As idle games go, one that works on mouse movement rather than clicks is somewhat innovative, and nicely sidesteps the usage of autoclickers to power throgh most idle games quickly (I myself like to do this xD).
One thing I'd like to point out though - as a bit of a science geek - is that the Watt is a unit of energy usage. The unit of energy itself is the Joule. A lot of people get Joules and Watts confused, and I notice you have here too. A battery contains electrical energy, measured in joules. When you create more energy to fill the battery, you are producing X amount of Joules/second. This rate is X Watts.
So to summarise, the battery capacity should be Joules (you have it as Watts). Idle power gained is Joules/second, so should be Watts (you have it as Watts/second, which is the rate at which the energy production changes...nvm xD). Rubbing power is Watts, you got that one right - you produce a certain amount of Watts by rubbing the pad, which fills the battery. :) And offline energy gained again should be Joules/second, or Watts (you have Watts/second).
Sorry, but just trying to help you sort out your electrical units. ;D