Okay so here's all the fun tips I usually give players who are having trouble getting those higher scores. I myself cannot get above 279,970 (YET), but at least this will help you get 240,000 which is the magic number (unless you are on the green car quest).
First off, you need a computer that isn't running slow. If the fireworks fly smoothly, then you're okay. If they are choppy, then you will have problems.
Second, your mouse needs to be good response-wise and the click sensitivity should be just right. You can adjust those settings in your computer's Control Panel.
Now for the actual game...
There are only four different patterns of the fireworks in terms of order in which they appear. Once you play enough, you begin to memorize the order. And even if you don't know the patterns, the order always stays the same. For example, if in one pattern the purple swirl comes out and then the red planet after, another pattern will have maybe the yellow star burst and the green circles. Whichever pattern, the two fireworks will always be three spaces away. So MEMORIZE the order of the fireworks at the bottom of your screen. That way you should never have to look at them. Also memorize the fastest way to get to each one. For example if you have the purple swirl, yellow starburst, pink triple circle, red planet and green circles...and you need to go from purple swirl to green circles, do NOT go through all the other fireworks by using the right arrow. Instead just move one back by using the left arrow. Faster you can move between fireworks, the better. Especially in the Tomorrowland stage, as that is where you have a lot of patterns where fireworks are three or more spaces apart.
When the fireworks come out, follow its path. Don't wait for it to get where it is going then move your mouse there. You will end up too late sometimes. Also do not put your cursor OVER the firework. Instead, leave it to the side or above. That way you can see it. Why? Because before it disappears, there will be a spark or twinkle. And it disappears usually a half second to a second and a half after that depending on the firework. Not counting the final firework you get, the blue star, the red planet disappears the fastest (a half second after the twinkle) and the pink three circle the slowest (almost two full seconds). Learn the timing and you'll be able to get flawless easier.
Sometimes more than one firework comes out at a time. It is better to get good than to miss. It is also better to get good and flawless than good and good or good and awesome. In the beginning, hit one fairly early, then wait to get flawless on the other. Once you have your timing down, try to wait longer and longer until you can get awesome and flawless. With practice, you will learn which you can wait to get awesome with and still hit the other before its too late, and which you have to get as soon as you can. Also, watch where the fireworks are going. Some patterns have them heading in the same place (even three can go to the same spot) and you can wait and get flawless on more than one.
Good peripheral vision I guess helps too. As you need to keep an eye on the next firework coming while still waiting for the previous to get to that flawless point.
Build yourself up. Don't try to hit that high score right away if you are not that good yet. Practice the first rounds as much as you can and experiment with timing. Learn each stage as you go.
Here's a scoring breakdown to help you see if you are on track to get 240,000:
1:1 = About 12,000
1:2 = Between 26,000-28,000
1:3 = Between 39,000-46,000
2:1 = Between 58,000-62,000
2:2 = Between 70,000-75,000
2:3 = Between 89,000-96,000
3:1 = Between 102,000-110,000
3:2 = Between 119,000-127,000
3:3 = Between 134,000-145,000
4:1 = Between 157,000-163,000
4:2 = Between 177,000-185,000
4:3 = Between 180,000-208,000
180,000 is the lowest you can end Frontierland at and still reach 240,000. If you are at 205,000 and up and play at the same rate, you will most likely hit 240,000 by the end of 5:2. If you finish 4:3 with better than 208,000, you should be able to reach 280,000. I have gotten over 270,000 starting the 5th level with 205,000. That last level gives you the biggest chances for points if you can hit them right.
And last but not least, HAVE FUN! If you're not having fun, it's not worth the stress. Hope this helps!