Attached is a really terrible 20 minute redesign, but the key points are:
Less text
consistency in button functions/more variety.
Key concept illustration in the back.
Make 'log in' and 'join' really obvious and easy
give credits their own page
change the in-game image to something slightly more graphical. Who wants a picture of more text?
added a tag line.
added 'donations' to the main bar.
As I said, this is really terrible and done in 20 minutes. The main thing is I think (maybe naively) these are all easy changes to make. You tell me; if you were a new player would you rather play the game on the left, or on the right?
I would spend more time on this, but it's finals week.
Obviously not perfect, but I like the general idea and your rough draft. I am pretty darn sure the devs will implement some of your ideas at minimum.