Starting to fix this unfinished game

I've started improving on this unfinished game that I submitted for a game jam (under the name "Hard Space Escape").

Changes:

• added new sound for when you collect 10 coins and get a shield upgrade
  
• added in some in-game text & lines to explain the controls and when you escape and win
• fixed the velocity indicator (it now points in the correct direction)
• fixed an issue where your shield would be reset when entering a specific part of the map