I started this review while watching the movie...
Umm so what kind of Constructive criticism do you want? educational wise? or entertainment wise?
Well as for the educational aspect of it, you did pretty good at explaining everything. It was simple and strangely cooler than look at textbook diagrams. maybe it had to do with the happy colours (yellow and blue from the...I forget [APT] and the...Seriously I forgot already[the other part of dark synthesis]).
As for entertainment, Considering its supposed to be educational, it was entertaining enough...Maybe during the eating part at the end, you could have has something eating the plant. Heh If you want to do something really cool I got the perfect tip...don't make it educational.