Reminds me of some old flash games. Nice time-waster, but I think the lack of feedback in the form of sound or any kind of visual effect when the balls are hit, detract from the experience. Also the controls felt unintuitive. Instead of the absolute rotation increase/decrease with the left-right direction, I would much prefer it if they were relative to the cannon. So for instance, when pointing down, left-right should be reversed, when pointing to the side, up-down should turn it accordingly. In fact at all times I would consider all directional inputs, and weigh then proportionally to where the target spot is located relative to the player.
I liked how the colors match the colors of the controller buttons, but not being very familiar with the SNES and not having memorized the colors, made it a bit harder to choose the right one.
