I must agree with matik. Also, for your buttons on the bottom, you might want to center it so the whole page looks more aligned
Yes, its too much simple, you can for example add a background to the central proxy space, and another to the website, to make a logo and a slogan to give the visitors something remarkable to remember. Good luck with the proyect.
Where is the server located? It is not fast from here in china atleast. Also, the design.. simple as you said but the buttons on the bottom still delay the loadtime.
Your major problem is the alignment. Actually, you should think about adding another color. Round corners also are not the best choice; I would do two square corner blocks with contrasting pastel colors for backgrounds. Let’s say light green for the top section and light blue or beige for the ads and form section.