One of the most creative interpretations for the theme "COUNT DOWN" I've seen so far! The visuals and storytelling are both very polished, and the "reverse" puzzle concept makes for an interesting brain teaser. I can imagine future levels relying on unique "reverse interactions" like the falling box, requiring the player to visualize where multiple objects will be at the start of a cause-and-effect chain.
Probably the only real issue is that it's sometimes difficult to "stop interacting" (or should I say "start interacting") with objects like levers and boxes once the reversal is in effect, which can sometimes cause the seconds to tick down despite no changes having occurred.