Understanding the way different robot’s strategies affect children’s perceptions of social robots is crucial for a trustworthy child-robot relationship. This paper presents a preliminary study on whether motivational strategies based on Regulatory Focus Theory and goal attainment affect children’s perception of a virtual social robot when solving a task. The ongoing pandemic (COVID-19) is altering the way we perform research. Hence, we designed a fully autonomous game with a virtual social robot. In an online user study, 25 children (8 to 17 years old) played a regulatory focus goal-oriented game with a virtual child-like version of the Furhat robot. We evaluated children’s perceptions of the robot’s social trust, competency trust, and likability. Also, we assessed the children’s affective state (valence and arousal) before and after playing the game. Our preliminary results show that in the prevention condition, fulfilling the goal elicited less happiness in children. Surprisingly, we observed a trend increase in the social and competency trust elicited by the virtual robot when children were prevented from fulfilling the goal of the task. We discuss the results and the effects of online setups on conducting user studies with children.