Makes sense
Well, it looked like Traveler said, no depth. The image is moving left, circlular piece is cut from it and glow added on top. I'm sure many image softwares can do the needed "bump" effect on 1 go. Roughly it means corners pinched radially towards middle and center scaled up. But doing that all by hand for each frame could be frustrating i assume, some frame was already a few pixels off the place but it wasn't very noticable.
Even when the animation has so many frames, trying to rotate the moon slowly looks animating in big steps so it was only watchable in high speed. Some fading effects could alleviate that, or there is no issue if it's shown almost still.
Also the looks is very cartoony. You could have alot more contrast even up to fully black side.
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