I love the design and concept of this game!
buuut there is one big flaw I think: because the destination changes every time you shoot it takes away most of the control of the player. As an example: I could try and shoot my ball into hole 1, if I miss the destination could become 3. So I have to get the ball into 3, but if I miss again? Who knows what the goal could be, this could be an infinite loop with only one good strategy: Wait at a hole until it gets picked, which is a lot less fun right?
To fix this issue this might be a fun solution: Give the holes more variation and pick a hole at the start of a level, this way each level has 6 possible goals for the player making the game replayable (to some extent)
Either way, nice entry!