Not sure I get how the theme connects, but the mechanic of controlling the floor instead of the player is really interesting, however the ball moves too slow compared to how long you have to react to the walls coming in, either the ball needs to be speed up or the walls need to be slowed down.
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Thanks for playing my game! I tried to incorporate the theme with the mechanic of having the ball pass through the ground plane by holding the space bar -- once it's on the "other side," gravity is reversed and the ball bounces off the bottom of the floor -- but maybe it didn't come across as well as I hoped. I definitely agree that the movement speed needs some adjusting. This is great feedback!