All in all, you did good work. There's not much to complain about. As for a short and sweet advancement that would offer the best "bang for your buck"... I would point out that the sound-effects seem to drown out the voice-over audio. You might need a little experimentation here, but should you tone down the general sound-effects and music (background) to add to the voices, storytelling, and "regular" audio, I think you'd find a remarkable improvement.
Of course, there are place where the physics gets a little stiff and some of the movements seem constrained, but the best advice on those matters is to "take your time". You'll get it all hashed out if you mean to. That's small stuff, even as visually impacting as any of it is. Relax, and lets get the story told. Right?