Thanks for the helpful comments StevenM!

@DawsonLIED, the file that is currently uploaded still has 259 colors. Do you have a version without the gradient? Thank you

The actual animation looks rather nice, and you seem to have put an opacity filter over it to simulate flickering light coming from the candle, which I understand completely. However an effect like that generates anti-aliasing and bumps the colour count astronomically, and the .gif file format has compensated by compressing the amount of colours to something it can manage (a maximum of 255). In turn, that's caused a huge amount of dithering or artifacting across all the different frames (to create the impression of a colour, the .gif draws criss-crossing patterns of other colours to 'fool' the naked eye) -- all of which really doesn't compliment your animation at all, sadly.

Would it be possible for you to reupload this animation with any existing filters or gradients removed?

EDIT: The artist is still at Level 1 and therefore can't make posts or respond to them, but they were able to DM me letting me know they did reupload the picture.