Cheers man, what are the chances of us both using those flowers! (Also your idea of the flowers representing the two sides by having lavender and sunflowers (sleepy and sunny/awake) sounds really cool!) I actually used the poppies instead of the other two as symbolism in this game. Poppies are associated with death (especially in my country), and the game makes you collect them right after killing the 4 little men.
About the boss, I didn't make it clear enough on how to beat it if I'm being honest. So for when you were pulling, you're supposed to mash the space button to keep tugging at the flower.
Also The Garden is just a little secret that doesn't do anything.