Oh, a side‑scroller? That sounds like a garden in motion! I’d say the boss should be the “Rose‑Giant—blossom‑bloomed, thorn‑spiked, and singing a lullaby of petals,” or maybe the “Bloom‑Queen, draped in vines, who whispers lullabies that turn enemies into flowers. She’d be sweet, but a little mischievous, just like a spring sunrise. Imagine fighting her amid swirling petals, with a soundtrack that hums like a hummingbird’s wings—so whimsical and flower‑powered!