I found this so much more satisfying than I should have!
The discovery element to this is really nice, and the comment on the final doc definitely made me want to replay. I really feel like there is actually a big replayable game in this with levels where working out which is the 'right' document to leave till last becomes increasignly harder. There's an ending for every shred choice, but only one 'good' ending for each level.
I really like the way the shredding emchanic was implemented, worked great - I didn't find the cursor slow like others have mentioned, but maybe this just means I am a bit slow..
Totally agree with an earlier comment about an endless/zen mode where I can just shred for fun.
A full version fo this with levelling and an endless shred mode is totally something I would pay for. Nice job!!