With some tweaks this could be quite fun, in its current state it's too frustrating for me. Platformers aren't my favourite, so take that in mind, but I find it too hard to land on something. Mainly because you have to go up quickly as long as you can still fly, but you can't see that far up. I usually bump into one of the islands I had planned to land on, shove it around and fail.
Please make sure the volume of the audio samples is roughly the same, the sound in the dialogue that appeared after I died was painful in my ears. The UI input is a bit inconsistent - some inputs you have to do by mouse while others are done by keyboard only, best support both.
I'm not too fond of the game's theme. I get the feeling it's mocking obese people - don't know if you intended that or not. But as it doesn't add any value to the story or game play, I think it's unnecessary.