Looks good to me. I tried the jigsaw game. My first instinct was to click-drag the mouse, which didn't work. But when I clicked once, the dropshadow appeared & I realized I could then move the piece. This was my experience, I'm not sure if a child would do it that way or not.

On the matching game, if you happened to get the match correct on the first try, the cards dissapear immediately. It would be better if the matching cards showed for at least a second before disapearing.