A great concept for a game, and there was real effort and skill put in here. Unfortunately, there are two main flaws:
1: You invest so much time into immersion, showing close-ups of your hero as a handsome, bold, silent protagonist at the hands of the cruel Nazis. But receiving a score at the end of each level breaks that immersion, reminding us that we are just playing a game. Same with the middle school narration from the hero.
2: It's either a stealth game or a puzzle game. It is difficult for it to be both. I could understand freezers and even rolling stones, but math puzzles? This seemed out of place and ruined the experience.