Nudging software developers to provide more, and better, feedback in Sprint Retrospectives can produce more effective Sprint Retrospectives, but developers tend to lack motivation for these meetings. We conducted a mixed-method study testing the quantity and quality of feedback with and without nudging for 8 weeks. Throughout the 8 weeks, the participants conducted two Sprint Retrospectives without nudging, and two Sprint Retrospectives with nudging activated. The results showed a 37% increase in the amount of submitted feedback and an increase in average semantic value of 40%. Participant interviews revealed an increase in motivation when exposed to nudging by the majority and overall satisfaction with the platform.