Good stuff! There were lots of things in these pieces that I'd have difficulty making myself.
My (uninformed) thoughts:
I thought the 1st piece needed a bigger climax at 8/9 seconds. As it is right now, it's slightly underwhelming. Also I wanted the outro after the climax to be slightly slower and more gradual.
The End of "A Beautiful Mind" was a bit sudden. Think you should have kept it going for another second or two.
I was wondering for "Thriller Sequence" how it'd sound with some percussion underneath - maybe a timpani (though if this is someone else's score I guess you can't an instrument they haven't added themselves).
Best Wishes
Yacob