Nice
I'm never rating games high, so 8* are quite well. It's also cool, that there are 3 endings: One on the top left, on the top right, and one downstairs, but to get there you have to go top right, too.
Each ending is very well made and I liked the fact, that there was no "good" or "bad" ending. What I didn't like was the same music all the time. It fits well to the atmosphere, but it's not really special and repetitive.
The controls itself were really precise, but you should adjust the gravity jumping. Still, it wasn't that a problem, since there were no hard jumping sections.
What I really didn't like was the restarting to get another ending. Add a safepoint after getting the gravity jump-item and it will be finde.
Oh and add morebackground information, e.g. of the war of the whites against the darks instead of saying, that he was seperated from his family every second note;)