space invader - v2.0

1. Add dying effect
   • vibration effect, etc
2. Add SFX & BGM
   • dynamic sound effects, etc
3. Display HP Color
   • identifying enemy's hp state, bullet count, etc
4. Add a Pause function
   • pausing game by pressing ESC key, etc
5. Add Setting function
   • screen resizing, game speed selecting, etc
6. Add various monsters
   • diversifying monster patterns, boss monsters, etc
7. Add Game Summary
   • game rule, manual, etc

space invader - v1.3

• Add summary
• Add boss stage

space invader - v1.2

Add setting function

• window resizing
• difficulty level

space invader - v1.1

Add pause function