You could benefit from one more frame post swing, to emphasize the ease out. And, for what its worth, you could put some more creativity into the 'drag' frame. I don't know if it's even possible to find a pixel art attack animation that doesn't use a drag. It's grown boring. It's not exactly a fair critique, I use it myself in every animation I've done so far, but it is definitely becoming that makes me cringe as of late. It does definitely look solid though overall.
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Looking to collaborate. Hit me up, especially if you are a GM programmer, or if you just have some sweet ideas.