Sorry if this has been suggested before.
I would find it helpful if when the character breakdown was displayed, the traditional version of a simplified character was also shown, and vice versa. So you'd write the character from memory, and once that was complete, also have the chance to take a look at its counterpart.
I often find that I confuse various bits of similar simplified and traditional characters, which means I remember neither of them properly. This might help to avoid that by letting users actively compare the differences.