This one has the the best 2D atmosphere for me, with the melancholy created by the music and the dark skies, well done on that :>
Gameplay needs balancing as it (seems?) to be impossible to perfectly protect all 3 flowers at the same time, so you need to sacrifice one or two to not get a gameover and then get the "dead" ones back in action.
As preu said, thank you for adding a tutorial, some other games were very confusing to play for me.