Demo update 0.2.0

[h3]New:[/h3]

• [p]Added a new enemy type (Level 2)[/p]
• [p]Added a new behavior for the green enemies[/p]
• [p]Targeting System Rewritten: Now prioritizes designated targets (e.g., green enemies and the new enemy type), similar to how the Boss is targeted.[/p]
• [p]Updated corruption level bar UI[/p]
• [p]Tweaked several upgrade levels, requirements, and costs.[/p]

[h3]Bug Fixes:[/h3]

• [p]Fixed a bug that caused inconsistent currency gain on player death.[/p]
• [p]Fixed a bug where double-drop currency values were not reflected in the end-of-level summary.[/p]