Very interesting concept and controls very well, though I think maybe a bit too difficult at the moment.
Having to not only aim the colour you're going for correctly but also having to make sure you don't mess up when you're cycling to the balls you need creates a bit too much of a time pressure at least for me, as while the time frame for hitting the block you need is relatively small there seems to be very few places you can fire that wont hit at least something, potentially screwing you over.
Either way, great job!