A merchant crosses your path -
"I've got nothing, I tell ya."
You are a ball. Rebound (lol title drop) off of the walls in four different stages to reach the goal.
Controls are on the title screen.
If you prefer to play the game online, you can find it at http://devnet.sonicgamesdimension.net/Rebound/
(Fun fact: The main inspiration for this game was an unreleased Game Boy Color game called Bounced.)