The End of the Squirrel (7:19)
IMDb; YouTube

This 2022 short film was presented by Alter in 2023.

Two siblings, Kit and her brother Jer, hide out from zombies, passing the time as they wait for the inevitable end. Jer plays piano and sings a silly song he wrote, as we see flashbacks to their time in their current hideout. It's a quirky and amusing short, tinged with grief over their impending fate. And I would totally watch a longer film featuring these two characters.