With pixel stuff, be extra careful to match the resolutions even when doing videos.
600x450 base resolution scales really nicely into 1200x900, also being divisible by 2 makes chroma subsampling not kick in, but making it 1920x1080 means that the pixels get much softer thanks to slight bilinear upscale to them and you introduce pillarboxing, those black bars on sides.

mairo said:
With pixel stuff, be extra careful to match the resolutions even when doing videos.
600x450 base resolution scales really nicely into 1200x900, also being divisible by 2 makes chroma subsampling not kick in, but making it 1920x1080 means that the pixels get much softer thanks to slight bilinear upscale to them and you introduce pillarboxing, those black bars on sides.

Thank you for tips! This one was my first "video" animation. I more used to just making gifs so this was a bit of an experiment. Hopefully I can keep improving! Again, thank you!

The lack of motion in the shoulders and arms is kind of awkward. Not bad, though.