Some sound fx should be nice. (if u change the move from l to r or up/down or if the sun get toasted by the lightning)
Maybe you can change the backround color to dark with neon blue lightning that would be cool. Also i didn´t know the exact "rules" how to play (how often/long can i place the sun in a lightning?) .. a read me could make things easyer (maybe put a link to your topic

in it).