This app exceeded my expectations. I got this app just because I wanted the audio for IPA sounds, but found videos which can have the playback edited, as well as a fun and helpful matching game.
My only criticisms are minor, and those are:
1. The interface, though very functional, could benefit from some more organization (for instance, the matching game is not distinct from the general playback area, and only serves to as a tool for confirmation).
2. It would be nice to be able to be able to choice a language and have only those phonemes from that language be accessible, so as to make things more simple and goal-oriented. Also it would serve as a helpful visual.
3. It would be nice also to be able to loop videos, or to choose your own pair of videos to loop so that you can choose a contrast of sounds and really get to know the differences.
However, these suggestions are minor, and this app does what it claims to do, and does it well.