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.