Updated to v0.5.2

All 3 levels currently in the game have been tweaked to be a bit easier (most of this is by reducing the distance for some jumps to make the timing a bit more forgiving). Additional signs have also been added around to guide the player in what to do.

The last bit of level 3 in particular has had more enemies added, intended to show the player that enemies can be boosted through.

The character's short hop multiplier has been reduced so releasing the jump key quickly halts upward momentum sooner.

Added a parallax effect to the background.