Does your request include animations or are they only sprites? If you want animated sprites look at my free enemy pack! Sprite wise I could try something since is less work than animating. If anything you can grab one frame from the animated enemies.
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I recently released the second addition to the enemy galore pack. There are about 7 animated enemies downloadable for free between both packs.
You can find them here
Regarding enemy sprites if I do them they would relate to the miscellaneous pack since upon defeat I think it would a be good idea for them to drop an item from that pack. There is a long list of enemies to be done ;3