Gamification introduces goals, feedback, challenges and visible progression into learning activities. It works best when the mechanics support a learning objective rather than rewarding clicks for their own sake.
In a vocabulary course, a learner might progress through recognizing a word, using it in a sentence and recalling it days later. A badge is useful when it represents a meaningful ability or milestone.
Evaluate outcomes beyond time spent on the platform. Accuracy, long-term recall and the ability to use new language in real conversation can provide stronger evidence that an activity is helping learners.