Add even more samples to your project, using the prebuilt animations or ones you create yourself
Use variables to count samples; increase the count each time a sample is collected
Introduce an energy variable so that the rover has to use a renewable energy source like the sun, to recharge
Animate the rover when it has collected enough samples (for example, it could do a dance and then fly away)

You can use any of the blocks that you learned about in this project, as well as those that you already know.

You can view the complete project here.