Hoi cool lightning usage^^
You got cool design there. Haven't seen much 2.5D sidescrollers in the jam so props to you.
Peeps said it already but reaction to action really helps in these kind of games.
or example when you attack an ennemy you can simply make him flash red for half a second to show the hit has been made.
You just have to polish your game a bit more and dadd some SFX and it will double in value^^
Good work!