Slightly Under Par
I first one I would have to say it the best. Each one after seem to get more and more unrealistic; as if the stickmen were in space. During these "anti-gravitational" movement you may want to try speed up the movement. But of course I am no expert on the matter. Just try tweaking it on your next to see what seems natural.
As for the buttons, they were a decent thought. Each one completely differing from the last might have set me off. Perhaps the point of them was to allow time for the viewer to play with the two "easter eggs", the ones where you roll over and/or press on the stickman during each movement intermission.
In summary I didn't think it was too bad for a first submission. The only real criticism I can give to you in this situation is too keep practicing.