Excellent design
It's been a long time since I actually wanted to finish a Flash game. The fact you cannot die combined with the endurance mecanism is simple, yet pretty effective. I didn't try a different ending yet, but I probably will, thus I think the game wouldn't suffer a lot if there was no choice. I admit it adds some deep, however.
I really like the overal level design. The progression is quite zelda-esque, but we all know it works, and it's well tweaked. Dialogues are minimal yet contribute to create a living world, and the flowers concept is both poetic and useful. It's a polished game, well done, really.