v019 - Ending story, and collab w/ Beatscribe

Cool news!
I decided to collaborate with Beatscribe for the music and SFX.

This update brings the following changes:

• Added start screen and level 1-2 songs;
• Added an ending story;
• Added a composer screen right after the developer screen at the beginning of the game;

Now working on the score screen.
More soon.

Antoine G.