I loved it, it has a lot of unique and good ideas. The fact that almost all the elements in it are only used one or two times and not reused many many times is excellent. You don't get the feeling of "oh this again?". Music great and as with all elements its not reused anywhere. The flying mechanism's balance of "you can control this many things" and the limited amount/limited ways of inputs (eg mouse + keyboard) are done well, I only had trouble a few times (eg landing on the walls sideways, rolling is not needed at all, etc).
And wow its long if you want to do it 100%. And in a good "wow" way.
To say something negative: replayability is basically nonexistent besides "collect everything". I don't think the language barrier added anything. The main menu looks great on a 5" screen but on a 27" monitor its bad but great again on a 65" tv (relative element size is too large on a normal desktop monitor as you sit "close" to it).
If you ever plan to do a "chapter 2" I'll sure buy that too.