Short facts:

• 6 Stages
  
• 4 Game modes: Novice/Original/Maniac/Omake
  
• Elaborate scoring systems
  
• 40+ Fully animated CGI enemies
  
• 7+ Huge fully animated boss enemies
  
• 3D scrolling CGI backgrounds
  
• Constant 60 fps
  
• Difficulty rank system
  

EX Version specific changes:

• First port based on the arcade original with all graphics and animations intact.
  
• Added stage and boss select for training
  
• Added full autofire
  
• Normalized diagonal player movement
  
• Improved button priority between shot modes (FRONT,LASER,BACK,AUTO)
  
• Increased player fast strike shield endurance
  
• Improved background contrasts
  
• Added additional background layer graphics
  
• 32 bit like graphic updates
  
• hundreds of small fixes