I think the white background is not needed, it should be transparent. Also, the red is very strong. Try reducing the amount of red in RGB and increase the green and blue to get more balanced colors.
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your palette actually has 17 colors, not 22.
I think the white background is not needed, it should be transparent. Also, the red is very strong. Try reducing the amount of red in RGB and increase the green and blue to get more balanced colors.
Here is a good tutorial for pixel art- link