A simple yet engaging puzzle game! Here are my comments.
> I like the music for some reason. It's very calm and relaxing. I also like the title screen where there's some fancy animation on the logo that actually teaches you the mechanics. Nice touch on the details.
> The art is simplistic but clean. I think one way to improve it is to highlight the elements that are part of the game (the mushrooms, the flowers, seeds, etc.) and contrast it against the background.
> The gameplay is simple but satisfying, although it can sometimes boil down to trial and error since there's no easy way of predicting the trajectory of the seed just by looking at the different mushroom types. Personally, I think it would be more fun if the way the elements react to the objects are very obvious to the player, and then the levels could be designed about thinking how to combine those reactions to reach the goal, rather than blindly experimenting with the tools to see what it will do.
> Related to the above point, I think the game can be balanced further and the level design could be improved. I think there are too many possible solutions in many of the levels (most of them probably unintended) because of the great flexibility of the different sizes and angles of mushrooms you are provided with.
> Finally, the user interface could be improved. Instead of having to click X to remove a mushroom, it would be much simpler if you could just right click. This becomes important because, going back to the above point, the gameplay has a lot of trial and error so it should be easy for the player to do that.
Overall, I think this is a good game with a solid base concept, but could potentially be improved much more particularly on the balance of the gameplay mechanics. Good job and thanks for the game! :)