It's weird feeling nostalgic about anything less than five years old, but here I am, reminiscing about the first time I was exposed to Five Nights at Freddy's... I'm pretty sure that video you linked to is what got me to subscribe to Markiplier in the first place, as well. But yeah, this really seems to capture how the animatronics look when the kids used to see them... you know, prior to the whole "leaking blood and mucus" and "smells like a corpse" events happened, of course. A lot of the creepy factor from the games was definitely enhanced by the dingy lighting and stark shadows, and maybe the graphics of the original game as well, but with all the brightening up you've done, it's how I imagine "The Good Old Days" at Freddy Fazbear's Pizza looked. Nice work, man!
Also, nice touch with the music link. I'm playing it as I type and man, that's bringing up those nostalgia feelings all over again!