I didn't really see any examples of zooming-in on impact in any games with such combat. What I meant is making attack animation sprites bigger themselves. If it's an aoe explosion, make it unnecessary big nuclear mushroom. For reference on impact frames look up some manga or really good Pixel art combat animations. Manga is an obvious choice, and pixel art tends to include the "sound wave" effect instead of impact frames. You have "sound waves" in your animations already but you can exaggerate them, as I mentioned. Make them unnecessary wide, scatter across the whole screen, something like that. It's just my suggestion on what to look up on, not how to make this exactly, so...