As per some feedback, I've added a random button, and some initial life, for those that don't know what to create. I'm still working on some of the other things people have suggested:

  - Saving the state of the 'creation stage' 
    and resetting it when the player clicks a restart button. 
    So you can experiment without having to redraw everything.
  - Wrapping cells around border (think Super Mario Bros 2.)
  - Easier drawing, using click and drag.

For those that have already tried it will likely need to clear their cache with ctrl+f5.