Despite having some of the loading screens take a while (which is where the missing 1/2 star went), the game was really good. All the mechanics worked perfectly fine and I didn't have any problems.
In my opinion though, that intro section should be later in the game. It's obvious that girl and Lea are the same person, so in the full game, I recommend leaving that sequence in as a flashback later on so that you don't have the awkwardness of learning the controls in a clearly high-intensity sequence.