The Gloaming (14:13)
Autour de Minuit; IMDb; Nobrain; Sabotage Studio; Short of the Week; Vimeo

This was released in 2011, but I first saw it in 2018. It reminds me of various other things, like The Little People on The Twilight Zone (1962), The Sandkings on The Outer Limits (1995), The Genesis Tub on The Simpsons (1996), Godfellas on Futurama (2002), Simpsons Already Did It on South Park (2002), all of which are predated by the 1941 novelette Microcosmic God (which I haven't read). And I expect there are other examples of the premise.

So anyway... this guy finds himself in the middle of a desert, or something. We have no idea of his actual origins, but he soon finds a sort of blob of matter, which he manipulates to form a miniature planet. As he watches, beings come to life on the world he created, and many generations pass, all of them full of warfare. He occasionally tries to intervene, to little avail. As for the result of his final intervention... well, I don't want to spoil that. So I'll just say the whole film is fairly interesting (and tragic), despite the complete lack of dialogue. Oh, and it uses multiple animation techniques, including traditional cel drawing, stop-motion, and I guess computer animation (though I'm not sure about that last one).