Since its your first time making a game for a jam, i would say i am impressed you made this.
I love the sound effects and the hit animation.
However, let me give you some recommendations:
You can use Unity's particle system for effects and play them
Trust me, not only would it make the game more engaging and look good.
for the menu or background, make it look good by making building or creating any drawings you want. This adds character to your game. Lastly, add a song or music to your game. If you cant create music, then use SUNO AI to create fire musi,c and its free.