Update 0.4

This update intends to help new players get used to the controls and to reduce confusion. Also added some polish.

Content:

• New animated main menu with sound effects.
• Added a screen displaying the controls before starting the game.
• Added a UI element when the player can interact when an object. 
• Added sound effects to the UI buttons and when making a delivery/completing a level.
• Restricted aspect ratio to 16:9 and 16:10