I love the creativity with the Spring theme and the variety you introduced to the gameplay. It's overall a very happy-feeling world.
I found the butterfly jumping section a bit frustrating though. Quite often, I found myself stuck in an infinite falling loop. It seems like the character gets closer and closer to the edge of the petal every time he respawns. It might be better to respawn the character in the center of the flower when he falls to prevent that from happening. Hitting the reset key takes the character back pretty far...
But when I did finally make it through that part, I thought the ending was rewarding.