An idea

So, I've got an idea: You play as a light entity, and your mission is to light up the whole level. You've got four things helping you: you can place stationary lights with unlimited lifespan; a light gun lighting up things in it's path; a plasma gun, that creates an explosion on impact and can destroy things (that's blocking light); and also some kind of melee light weapon that can destroy light sinks (like black holes, only worse for light, and some can move). It'll be interesting to see how it'll turn out.