- the length (I think it was a bit too long, but maybe because I was eager to see what happened next in the story)
- I played in the level next to the easiest and it was fair, but some scenes like some big boss battles were a bit too much "guess what you need to do next" and sometimes it wasn't obvious
- no map/indications, that was the worst thing. A lot of times I was wandering around unsure where to go next. I think that was unnecessary, a simple indicator to at least the direction to go to proceed would have been better
- the ending left me with mixed feelings
Spoiler: