Your game is really good. The main idea is cool, the presentation is top notch.
I would have liked more explanations though, I spent a long time kicking the debris to outer space before realizing I had to burn them. I struggled very hard with the controls too, I think on my whole playthrough I managed to kick only 2 rocks into the flammes.
But even though I'm terrible at this game I have to recognize that it is very well made!