Hey, thanks for the feedback! The problem here was that the face on the right is actually a 'wide oval' shaped face, whereas the target is a perfect circle. So the game code considers them to be different shapes, but at a glance they look very similar. Sorry about that!
This issue has actually been rectified in the newer version (which is available only on Steam for now: https://store.steampowered.com/app/1144150/Singled_Out/). The wide oval face shape has been replaced with a different shape with more of a chin and eyebrows.