"conveyor belt" is the one I just can't get past. I did love how it was so complicated. You would think it would be easier after awhile. I'm always tempted to look at the walkthroughs. I know they exist somewhere. The music was quite nice too.
It seemed to be pretty melancholic. I wish you could change them as you go on! I know that would be too easy. This was great for something made in 48 hours. If it was nothing but 48 hours straight, you did the job well!