Improvements:

• Performance improvements.
  

Fixes:

• Fixed possible softlock in W1R6. (Thanks, Niko!)
  
• Fixed typo in W6R5.
  
• Fixed world specific speedruns always showing "World 1" as the title. (Thanks, Redstoneboy1009!)
  
• Fixed restarting a speedrun from the pause menu releasing control of the cat 0.2 seconds too late. (Thanks, firecracker!)
  
• Fixed seemingly random invulnerabilities from bugged death/damage states. (Thanks, yogurt!)
  
• Other, smaller fixes.