Oh goodness, haha. Doing this project I've learned that there is a great deal of variety in handwriting style. Single-stroke vs. Multi-stroke 5 for example, seems to be a big point of contention. I'll extend the decision tree to be more friendly about bottom-starting strokes.
I start many of my letters from the bottom, and everyone tells me I write opposite-handed. This recognizer definitely had problems with the way I would naturally write a lot of the letters...