The idea is to provide a simple, convenient way for people to give and receive anonymous feedback. I think feedback is very important for growth and to be more self-aware in general, and the barrier to give feedback to somebody is far too high relative to the benefit this feedback could mean to the receiver.
The comment by dijit I think sums up my motivation to build this pretty well.
To be honest though I don't know if this app solves the problem. The way the app is currently, feedback is initiated by the person seeking feedback, whereas in the examples above it's the feedback giver initiating (or looking for a way to provide) the feedback.
There is still value in this case where the feedback seeker initiates the feedback loop I think, but it doesn't quite solve the problem I initially set forth to solve. Maybe that use case can be addressed with further iterations.