I have no other choice but to give it a 10. It is a beautiful movie. Yes, the theme is "war" but the subject isn't. I saw it as a movie purely about friendship and nothing else. Yes, both boys lost their innocence due to the cruelty of war. Yes, their friendship got to be tested quite a few times throughout the movie but at the end it was their friendship that saved both boys.
Both boy actors, Maas Bronhuyzen and Joes Brauens were terrific. They conveyed their feelings and emotions in a way a seasoned actor would do. Dialogs were short and to the point without wasting viewers time with lengthy conversations trying to convince viewers about main characters feelings, emotions and thoughts. In three specific scenes the facial expressions, the emotion and the acting in general felt very real and convincing. The ending scene sealed the movie and the friendship and with no doubt it became obvious that both friends have their hearts set in the right place.
If you haven't seen it yet, make an effort then.