I think you pulled off the two color design in this game quite well. It's looks great and I think the color scheme you chose fits well with the idea of a garden.
In terms of feedback, I do think the music and sound effects can be adjusted to fit the theme of the game more. While I do think they are good on their own, I'm not too sure if it fits the aesthetic and setting of the game, but this could be based on my preferences and interpretation of what you were going for.
Overall though, this was fun! I managed to make it all the way to wave 13 before my arm got tired haha.