Day/Night theme, AJAX, responsiveness

We just updated our website, http://www.porkygames.com ,

- It has AJAX (scroll down)
- Responsiveness (resize the window)
- Day/Night theme (we're quite proud of this; choose with the buttons on the right side)
... notice that the Day/Night theme is auto-generated with JavaScript for every reload !

And it should also work in IE

What are your thoughts about the website?