Wonderful game for kids! I love the idea of a game that teaches while you play.
I found a few small bugs, though:
1) On stage 2 in the middle right section of the map it is possible to stand without a platform (I supplied a screencap)
2) The hamburger patties (I assume) do not have a sound associated with them when your player moves over them
3) Occasionally, I was unable to pick up any more groceries after I dropped one into a cart. This seems to happen if I drop a grocery and then try to pick up another before the previous drop has completed.
Wonderful job! Keep up the good work!