Day 2:
Came up with an extended game concept. It may include more than i'll be able to complete in the time period, but I'll probably continue working on the game after the jam.
I thought it'd be neat to be able to swap between different "pinballs" with different functionalities. The game would basically have 2 layers: one for the hedgehog, and a higher layer for some type of bird. This could allow for some neat puzzle mechanics between layers, such as buttons, switches, etc.
I also thought it'd be important to allow the player to launch the ball at a 90 degree angle if caught. Additionally, holding a character in the paddle would enable switching between the two. I'd probably just create two layers by defining different collisions for each ball, rather than creating a Z plane.