Relaxing little game with nice visuals :) And for sure, it fits the theme!
I especially like what the stardust look like ^^
It could have been nice to see the colors on the plants as well :) And maybe have the different steps of the plants growing? Some audio, even just click sounds, would have been nice too.
To make simple songs and click sounds, there is this free song maker made by google: https://musiclab.chromeexperiments.com/Song-Maker/ :)
Anyway, good job for this game!