Demo update 0.1.5

[h3]New:[/h3]

[p]Increased the initial attraction radius for currencies.[/p]
[p]Added function to pan the camera in the upgrades menu with WASD and arrows.[/p]
[p]Tweaked the mouse panning speed of camera in the upgrades menu. It is now faster and more responsive.[/p]
[p]There is a tutorial pop-up window now when entering the gameplay screen for the first time communicating to the player that enemies do not damage the player directly, instead the player takes corruption damage in time.[/p]