Wow, this game kinda surprised me. I really like the light-throwing mechanic, though the character's physics were pretty difficult to control.
I really appreciate your effort to cover a real + gritty topic, I tried to do something similar with our game. However, I would say that I was a little surprised when the first WWI slide popped up – it was a bit unexpected after the playful tone + cute character of the platformer!
You might want to consider re-designing the platformer a little to reflect the WWI theme, so that the WWI storyline feels more connected to the gameplay. Just a suggestion!