[The Mothman]

saw this last night, and i have to admit, it was without a doubt an excellent film, beautifully directed and very funny too...but i didnt really understand it. perhaps someone who has seen it before could explain the following?
wtf are those little floating blue light things?

Whats up with the 3 girls who look excatly the same that the dude gets with?

Whats up with the world pretty much ending after that tunnel, and finally, if there is a meaning or philosophy type thing behind the film, what excatly is it?