The animation with the fan(?) being constructed looks nice. Maybe since the projector is so animated and the fan has some squash-and-stretch going on, the pipe should distort a bit as the fan-body is coming down, nearing the exit?

For how long the countdown takes, there's very little payoff. Maybe slow down the video (but not the countdown)? Maybe even cut the countdown to 3 seconds instead of 5.

I'm not fond of the glitch effects in the video, since it's implied to be film and film doesn't glitch like that, it has other kinds of glitches (it can be MADE to glitch like that, but it doesn't naturally). Instead, you could have effects like frames being misaligned (poorly edited film) or freezing (shoddy projector), and scratches on the film (remember that frames in film are in sequence, and scratches affect the sequence - they don't get repeated, and a scratch reaching the bottom of one frame will likely show up at the top of the next frame).

The screen colours are wrong. When the screen comes down, it's beige, but the darkest parts of the film are black - projectors work by illuminating the screen, they can't make it darker. That's why projectors are operated in the dark! Maybe have the lights go down during the countdown? So the count down would start in beige-on-white, then as the light fades (or just sharply turns off), it'd switch to black-on-white. If you do that, I think it'll help put the focus on the film, as well as make the whole piece feel more polished since you'll have two different lighting situations (first well-lit by whatever light you currently have, the second lit up by the light reflected from the projection screen). You could even have the highlights vary a little depending on how much of the screen is illuminated - it could look really cool, without being distracting.

Everything floating in the void looks odd, and at first didn't register as a unified scene. Will there be a background eventually?