More enemies, basic sounds, and particles - Version 0.7.0

Did some more code refactoring but have to make a small announcement here too. I am going to be cutting this project off sooner and calling it completely sooner. I like going big on things and I had more plans but seeing this as my first project I want to keep branching and learning new skills while using the Godot Engine. I'm a new developer and I want to keep learning so that one day I may be able to make something that is clearly part of my vision.

Changes in Version 0.7.0:

• Now enemies have been added!
  • Homing-type: Shoots at your last recorded position.
  • Eye-Type: Shoots in 8 directions.
• Scores changed for the old enemies.
  • Fast-type: 20 -> 70
  • Basic-type: 35 -> 105
  • Heavy-type: 95 -> 285
• HP Values for the Fast-type enemy has been changed:
  •  2 -> 1
• Enemy bullet-types' speed has been adjusted:
  • Regular shot: 70 -> 60
  • Homing shot: 55 -> 50
• Death particles have been added for enemies.
• Player speed has been reduced:
  • 110 -> 100
• Added a way to pause by pressing <Esc>.
• When you lose the game, there is a screen that tells you now.
• Game difficulty has been adjusted to be easier at the start but scale faster.
• Basic sounds for player shots, enemy shots, and enemy explosion has been added.

Like said, I want to wrap this up and start working on another game title. So we are almost there. Some aesthetic things I want to add/change and try to refactor the enemy spawning. Thank you all for the support and it's been fun working on my first ever project!