Great pixel art great music! The game really fits to the game. Three suggestions tho.
I think it would be better if you could move diagonally, because I thought it was pretty hard to control with only the horizontal or the vertical axis.
Regarding the second suggestion, I think you should make a small description of your power up, because most of the times, I didn't get what they do.
And the last suggestion, it was pretty hard to figure out the value of the plants you cut, so I think you should display how many points you've got from a plant.
Besides that, great game, it's really fun!
Good Job!