I agree with everyone else here, that you should choose a specialty path and really hit it hard to show your greatest strengths. Getting into other areas isn't bad though either, as it will show you know the whole pipeline, but sometimes not the best to put on your portfolio for what position your really going for. That's…
Yeah there's some crossover between level designers and game designers. Game designers are probably going to focus on gameplay as a whole rather than just the levels themselves. I don't have much/any experience in either discipline so I don't know for sure but I'd bet that there are places where the game designer and level…