Graphic tweaks

[Jjp137]

I did a bit more work with the graphics. This is what I did:

• Gave the gameplay background less saturation
• Basically removed all the ugly white pixels from each of the textures
• Drew edges on the ends of the platforms
• Added an okay menu background

That's all. Not a single line of code was changed this time :p

[Twisol]

Love the changes. Thanks!