Just like the name implies, it is in fact a platforming game about the Berlin Wall. Of course it handles the subject matter with as much maturity as you'd expect from a video game - You run around digging holes and dodging monsters while collecting fruit.
No wonder it took so long for east and west Berlin to unite, they didn't collect enough fruit! I don't know if there is much more to the game than that, I only played it for a minute. Even though it's made by a Japanese company, they really should know better. This is probably the worst idea for a video game since my Auschwitz kart-racer.