Frustrating
I liked the concept of the game and it kept me hooked for quite some time, but I always ended up being frustrated at the blocking sequences at the beginning of the level, it's like having to pick a number when there's no one in line.
Try to somehow make the introduction less blocking, make the tutorial a small popup that's there in case you need it and let the user skip the introductory cutscene.
Just my $0.02