As far as first game jam submissions go this is a solid game, very simple yet fun gameplay with easy to understand game mechanics and responsive visual feedback, good job bro three cheers. 

P.S please try my game

A simple but very enjoyable game!

A great example that you don’t need complex mechanics to make a game fun! Really cool for a first jam!

Some subjective feedback: if the dash followed the ball’s velocity vector, it might feel even more fun.

Thanks for the game!

P.S. I love the ability to move the ball down, not just jump!

Great first jam game. Simple yet replayable game loop. Could have benefited from some more visual juice, but that's something cool you could apply to your next one!

What was your reason for putting dash on "N"? feels like a very strange key to have to press for a common game function at least on QWERTY keyboards.

The game is fun, but here are some points I would like to know/share.
How am I receiving damage?
And instead of the dash only being left and right, the dash should be performed in the direction the player was moving! 
By all means, great concept, I see this as only a prototype, but you could turn it into something as cool as samurai slashing through enemies! 

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.

how do I get score points?