Should HarFrog and I change the design on the page, or does it look fine as it is?

Changing the design would be cool. Custom designs are generally better in my opinion. You can also change the ? image to something related to the game.

I can try and do it tonight after school, I will crop the logo, and MAYBE make a banner at the top of the page, which will be at around 3pm GMT, unless I go out tonight.

Yes please, you can start by putting the slime on the picture.