Flame Ball, Ghost Ball, Achievements!

Major Features

• Add Ghost Ball and Flamethrower Ball
• Implement powerup ball pool system, replacing scene-linked balls
• Introduce public match mode with a mode selector
• Create mid-game join feature
• Implement Steam achievements based on statistics and certain objectives
• Add spectator mode and improved in-game player statistics display

Minor Features:

• Upgrade the appearance of power up balls
• Separate UI elements into tabs and display current streak in-game
• Switch to more performant build process
• Introduce host input delay and remove login screen
• Customize looker to match player color
• Add ball trails, updated graphics for power up balls, and edge smoothing

Bug Fixes

• Fix bug where same ball color would appear for multiple players
• Ensure proper handling of players leaving mid-game in Plague mode
• Disallow incompatible game versions