Overall the raindrop placement coupled with the player's speed were really problematic. Often you were to far away to catch them. To change the game flow a bit, you could maybe vary the raindrop speed or make it so every once in a while you get a water raindrop that heals the plants if it hits the ground so you have to avoid it.
I'm also not sure how the score works. The value increasesd every few raindrops in an unpredictable way.
The graphics weren't bad. Maybe some more sound effects could have helped though, but other than that good job!