reIterate() Alpha Mode - v0.2

Changelog:

• (Hopefully) Fixed a bug where you could fall through the floor and not die, just vanish into the endless void
• Fixed a bug where you could accidentally jump to the Main Menu immediately after death
• Fixed a bug on the level select screen where selecting ‘4’ took you to ‘3’ instead
• Fixed a bug where hitting a ‘jelly floor’ wouldn’t reset your double-jump. 
• Fixed a bug with the toggling platforms where you’d land on one and then still fall off

• Changed the arrow behaviour to destroy themselves on level walls
• Changed the default controls to something less stupid (Spacebar is now jump, ESC is cancel)
• Implemented Coyote Time
• Deus’ glow effect will now change in intensity, to visually tell you whether you’ve got a double-jump left or not
• Cut out like a billion shader effects because it ran like butts
• Changed background layers/sprites to be more efficient for the sake of performance
• Hitting the wind now grants you back your doublejump