Those aliens are gigantic, so the sprites are that big on purpose, despite being designed to blend with MK 3 sprites.

To whoever is interested in those 2 spritesets:

First of all, i'm well aware there are some wild pixels, i hunted down most of them, and i'm confident i'm releasing sprites that require minimal manual work to be corrected, anyway most of the construction tools will warn about those wild pixels.
i'm going to hunt down the last of them if i'm using those spritesets in a project of mine.

Throws explodes might be another issue.

I'm not developing any MK related project, so i didn't create throws-explode actions* for those sprites, if you are interested in developing a game with said sprites but don't know how to create throw explode action i would gladly comply in reasonable time, but since this sprite doesn't belong to my current project, if anyone asks me to add the throw explosion actions, should demonstrate to me they is serious about using this sprite.

I might decide in the future to revisit this sprite and add said actions, however anybody is free to create those cels.

In case you create them, i think it would be appropriate to publish them along with the parent sprites.

Also, it is possible that a game comes appealing and fun to play even without those cels.
Applying them might be an exageration, since in general, if a throw happens fast enough, the player's brain will spontaneously reconstruct them.

*In english: the parts of body of who's performing the throw that are visible above the target's sprite