The idea could work, but isn't developed at all and you can easily circumvent the challenge by just shooting at the floor, close to the enemies... This way, it's very easy to calculate how the projectiles will bounce.
Very aware of the floor, I contemplated ways to make the floor not work, but really couldn't think of any that didn't seem like gimmicks. I had several problems and lack of time overall, I spent maybe 7-8 hours on the game out of the available 48.
