Unboxing a difficult to find game: Gibberers!

About エスペライゼーション (Gibberers: The Word Game of Language Invention and Civilization Development), from BoardGameGeek:

People with different knowledge and languages met and united as a new tribe, creating a new language and developing civilization. Gibberers: Invention of Language and Civilization is a word game akin to field linguistics. In the game, players become primitive humans who meet aliens and create a new language that allows them to communicate. As the vocabulary grows and generations pass, the new language evolves like a tech tree. Communication limits mean players will be limited to only the new language during most of the game. During Generation Zero, players construction their language using cave painting postcards and with one player acting as Mentor. Once the basic language has been created, players play for 7 rounds over 3 generations. At then end of the 7th round, the team wins or loses depending of if they can guess the final word in their new language. The "expert" game increases to 15 rounds over 5 generations and also increases the communication limits during all generations. Points are assigned based on the number and types of development tokens.