Wow--great job--this is epic! I see all kinds of improvements--your sets have great detail in this film. Someone commented that the animation was choppy, but you have come a long way and to me it was pretty smooth and improving with each release.
I really enjoyed the variety of voices... that's a big cast. Your writing is always top notch and I like that your stories are always the focus. With that in mind I think it'd be cool if you peppered in some more action moments for a little more visual fun.
The only other suggestion... don't forget the importance/impact of your soundtrack. I think adding more ambiance / sound-scapey crap would add a lot. You use your music effectively (loved the build up of the first scene, with yours truly) and adding the background sounds of a lab would have taken it up another level.
Keep up the great work!
Woodrow Village Films