Maybe make it so that after a certain number of hits the meteor just blows up? Sometimes when they just come straight down on top of your cannon, it can take 6 or 7 hits to knock it out of the way.
How to do each level: 1. Click and hold through 2. Click a lot to make the dot stay down 3. Click every time the dot "lands" 4. Clicking makes the dot fly up, letting go makes it fall, it's like that helicopter game 5. Click and hold until the dot gets 3/4th through, then let go 6. Click as soon as the dot starts to fall 7. It's a catapult, hold it down for about 1/3 the way down 8. When the dot appears, click, when it disappears, let go 9. Clicking makes you jump super high, so after the first jump let it fall to the bottom basically and just repeat that 10. Same as #2 11. Click as soon as the dot starts moving backwards 12. Same as #4 13. Just click as soon as the dot is visible