I thought this was fun, more enemies would have been interesting, having a full level and then the boss fight would have been much more fun.
But that said this version is great for a jam, you did very well to complete this in the time provided.
Very interesting concept loved that you always know where everything is with the markers. Only issue I had was it seemed pointless to have the platforms as I could easily jump over the boss and just keep throwing the ball at them then going to collect the ball and repeat.
Regardless, this is great and could do with more development.