I like the ships textures

Change the planet Water , it is too much bright and blue ?
Or perhaps it's some alien planet with special liquid ? perhaps change color to avoid people comparing it to heart ?

You should avoir point lights on the ships , it will be GPU intensive and A8 is not Unreal 3 or Cryteck engine !
What you can use is simple oriented sprite flares with culling perhaps.

Example :
http://www.unrealsp.org/images/gameguide/whatis/tournament.jpg