The graphic is no problem. The shooting is smooth and satisfying.
And some of your sound effects are perfect, but some just don't fit.
I once played a game just like this, randomly spawned enemies with a shooting character, but I adore this art style more.
This game has potentials, whether it's a party game or rogue-like game. (Mainly because of the visuals)
I think you should work more on this after the game jam. :)