* Updated player movement properties. Less floaty.
* Player can duck.
* Adjusted collision area for player.
* Updated difficult sections of several levels to be more forgiving.
* Can toggle between full screen and windowed mode without restarting the game.
* Change UI color.
* Spiked block enemies now more colorful.
* Update audio so long plays of the game won't result in glitchy audio.
* Fix position of off screen arrow.
* Pause game if window loses focus.
* Draw collision areas on mini-map.