Introduced a parallaxing background. The background is currently just a placeholder, but the parallaxing affect seems to be working fine. Definitely better than a empty blue background!

On a side note:

Enemy and player cooldown calculations have been reworked. Removed the stat "Attack Speed." Instead, dexterity value directly translates into attack cooldown. Enemy cooldowns can range from 3 seconds to 1 second, and player cooldown ranges from 1 second to 0.1 second. 

Should reach version 0.7.0 pretty soon.