Do share the name of the short, if it comes to mind later.
DUST make a lot of cool sci-fi short films, worth checking some of their others too https://www.youtube.com/c/watchdust/videos e.g. Bleem, the number between 3 and 4, slightly remeniscent of the film Pi and the crazy mathematician trope https://www.youtube.com/watch?v=qXnFr1d7B9w or Orbit Ever After, a love story in a dystopian Brazil style future of orbital habitats https://www.youtube.com/watch?v=DpFXMIxlgPo
And just because, from another channel a https://www.youtube.com/watch?v=vBkBS4O3yvY a short about quantum suicide - One-Minute Time Machine | Sploid Short Film Festival.