Cute visuals and nice, simple concept! I had trouble trying to get around and collect food.  I feel like that the zero gravity(?) part can be explained/connected more because it threw me off at the beginning at first. And, I think it would be nice if the balloon was not treated as an object or was smaller because I started bouncing around a lot. Overall, cute game, but it's a bit tricky for me to get around. 

Really cute graphics, the game looks very nice!

I had some trouble with the controls at first since it was a lot to take in, but after playing the game for a bit I figured it out! Using the thrusters alongside switching between gravity/no gravity was a little difficult though! Maybe because the thruster particles are actual objects? Since you're using Unity, I'd personally use Particle Systems!

Regardless, I do like the story you've created inside of the game, I think it's very cute