Replace or supplement endless mode with a wave-based structure (e.g., 10-15 waves) culminating in a final boss encounter. Each wave should introduce new challenges or enemy types. Add a wave/boss progress indicator to the HUD. Optionally, unlock endless mode after completion.
Replace or supplement endless mode with a wave-based structure (e.g., 10-15 waves) culminating in a final boss encounter. Each wave should introduce new challenges or enemy types. Add a wave/boss progress indicator to the HUD. Optionally, unlock endless mode after completion.