Criticism on my GBC sprites?

[Mr. Jam]

One thing that bothers me is that the guard animation is using the sheets transparent colour as it's flashing colour. Because of that, all the white on the inside of the sprite will be transparent.

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for the waddle dee, I would remove that dot on it's foot in it's idle and replace the brown with an orange or a red colour.

the other enemies seem to have some anatomy issues and are not quite accurate to their original designs.

I would recommend looking at some of their existing sprites as a reference.
Just take a look at the shape of twizzy's head and it's wing locations, the eyes on bronto burt, or the shape of grizzo's body for example.

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I hope this helps a little.