This has a very interesting concept and I can absolutely see myself playing this game with a friend, although I can't at the moment. I like the take on the theme but it could have been emphasized more. I think with more time and possibly more mechanics or features this game would be even better, and right now the main thing it is missing is more content/mechanics. Maybe there could be an option for more than 2 people, or the map could have a moving obstacle or something like that. 

Game works well for the theme.

Really liked the idea, couldn't consistently magnet the ball, it almost always immediately threw it.  Because the ball does drop in from the top, spamming throw at the top really brings it down to who times it better, or gets the luckier timing. I couldn't seem to catch a ball if it was thrown by the other player, which felt a little odd. I assume that was intentional, but I think it would have been neat to be able to catch the other players attacks.

Cool concept, if the magnet worked more consistently, it would solve some of the issue of spamming throw at the top I think, maybe separating the controls for magnet and throw to different keys would help.

Really interesting concept! Unfortunately I wasn't able to play it with a friend. I was very confused at the start because you called it a co-op game in the description, but in reality it isn't. I was trying to shoot the ball with the left one and catch it with the right one.
 

While it could be something interesting to play with a friend, which I unfortunately don't have :(. I don't see much point then just camping the ball and mashing the throw button from both sides.

Sadly don't have a friend to play with but this was still super cool. The visuals/audio are awesome and fighting over the balls dropping is a fun idea.

Really impressive that this is your first jam, hopefully you both had fun!