Funny. Beautiful. Extraodinary. And inspiring! At last I found a masterpiece with choices that I actually would do in real life (speaking of playing mad when caught on assimilating with boxes ;P)
The arts, interface design and programming are really neat. Not too many special effects and colors, but all in the right place, time and amount. Ah, I really like the design and the work of programmer. My eyes enjoyed it :)
Let's see... The only thing I didn't mention so far is music. And it's not because I ddn't like it. I did. Only, when immersed in the story I didn't pay much attention to it. But it is actually really good. The music and sound effects felt natural. When actually stopping for a bit (wich is problematic, because the story flows smooth and interesting) you find out soothing melodies that are hard to stop listening.
And for some reason I'm captivated by the clicking sounds and the sounds of the fan ;P
Overall, though it's just a demo you've done a greate work and it will definitely shine and win more hearts when released. Thank you for you work. And good luck!