Watermelon Combination

[Core Rules]
1. **Movement and Safety Mechanism**
- Tap the screen → The target fruit moves to the tapped location.
- **Release your finger** → The target fruit immediately stops and enters a safe state (it cannot collide with other fruits in this state).

2. **Merge and Evolution**
- **Only collide with fruits smaller than or equal to your own size while moving** → The progress bar fills.
- When the progress bar is full → The grape upgrades to a larger fruit (final form: Watermelon).

3. **Failure and Result**
- Colliding with a larger fruit → The current level is immediately restarted (the grapes are reset to their initial state).
- At the end of each round, the current score and the highest score are displayed.