I couldn't figure out how this entry fits with the jam's "corruption" theme. Besides that, I liked the game visuals and ambience.
There needs to be a better way to help the player aim at the ball. I couldn't figure out what was the right placement to get a hit. I think I only got some hits out of pure luck.
It's not obvious how you're supposed to aim the box to get a homerun. Maybe you could add a ball trajectory line and change the box color when it's in the collision path so that all that's left is getting the bat timing right.
This is a good prototype but I feel it needs more work to become an enjoyable game. Keep at it! :)