I thought the opening sequence was great. Seeing each part fall off gave me a really good sense of what my goal was, and the bat flying off with a bit at the end made me laugh.
The bad points are standard game jam platformer things. Add some coyote time so I can jump off the end of a platform without pixel-perfect timing. Make the hitboxes on the player and the spikes bigger than the art, so I can have a near miss. (http://devmag.org.za/2011/01/18/11-tips-for-making-a-fun-platformer/)
The sheer number of robot bits was impressive. I particularly liked rolling over to my legs at the very beginning, and getting my head back.