the author was asked to add the API to the game, but this game still hasn't it. Without the API, kong can't implement any badge/challenge. When the author will add that feature (he said that he needs quite a bit of time), then we can actually expect badges on this game nowhere late.
Why don't people like this? I think its great ^.^ Certainly original. Definitely one of the better TD games, skill points, level progression, lots of variety to choose/upgrade from. And its SUSHI!! ^.^ ²