Symmetry Exercises for Kids

Purchased this to help my six year old son. The free drawing section is good, but would benefit from being able to put a dotted line in for the line of symmetry rather than a solid black line. This would then bear some relation to the examples within the app. I think, at present the examples used on the easy setting are still possibly too hard for a child who is struggling with the concept of a mirror image. I haven't even looked at the hard setting. I