Here are my c and c:
1. It seems that the jump video and the last walk video were not uploaded properly on youtube. It might be just my computer, but still do check it.
2. As manimator said, be sure of what you are planning to do. The box and ball squash and stretch exercise, seemed as if it was done without any planning. Dont introduce squash and stretch, just because they look "cool" . Be sure that it is supported by the story or the concept that you are having
Nice attempt though. Keep posting and enjoying animation