Did it, it was not easy but still manageable, I would say that the difficulty is just as it should be.
I liked the idea of the game as well as the general atmosphere. I think my favourite thing was maybe the voice telling us the level reached.
The different levels are well designed and the difficulty progresses gradually. Maybe I would have put the rotating "stars" a bit later (for me they were, by far, the most difficult things to avoid… the later obstacles are more impressive but in the end not too difficult to avoid).
So, congratulations for making this nice game.
Also, I noticed something that looks like a bug: the fullscreen mode makes the levels much longer (at least on my computer), maybe twice as long or more (and the same patterns are repeating several times in each level).