Demo updated to v0.2.2

Improvements and fixes in this version

• Added best score to the level summary screen. Players can now reflect on and compare their previous and current results.
• Added a visual cue to the operator ability. The operator ability is activated by holding the button for 1 second. I often noticed, however, that players tend to press the ability button briefly, get confused when nothing happens, and then stop using it altogether.
  To prevent this, I added visual feedback to indicate that the ability is available and that the button must be held to activate it.
• Refactored the code responsible for the speed debuff while an anomaly is active. The behavior is now more stable and expandable.
• This refactoring also helped fix and reorganize certain enemy states (specifically when an enemy is disabled by a player power-up).