Nice little game! From the looks of it, seems like you are just starting out on your game dev journey? If so, congrats!
While a bit rough around the edges, I can see the potential with this! There are some strategic elements from the big ultimate move, like rallying enemies before triggering the attack, killing multiple enemies. You can definitely keep going with this.
Things like screenshake, hitstop, hitflash, can sell the experience better. The audio does get kinda loud when you kill multiple enemies at once, so you should set a limit to how many sfx play at once. And, yknow, probably more spinning to win so it fits the theme!
All in all, nice work, and congrats on finishing your first game jam!