A very original idea for sure, but the execution is unfortunately just a bit iffy. You have a very small window of error for each stroke, and especially the ones where you have to paint kind of upwards were almost impossible to get for me. Having to start all over after just one mistake is also very harsh, perhaps having multiple lives could be a better alternative for this. Plus, the strokes on the canvas did not even remotely line up with my mouse (although that didn't matter too much, as I barely had time to look at the canvas anyway). I do see potential in this idea, it's just that the core gameplay loop isn't quite there yet.