In regards to the 2nd part of your question Sabine, I have the same issue. I can answer questions and see other answers when I google an issue, but when I search within the KingCare website itself I can't see answers, and I can't comment or reply to other people's questions.
I completed all 3 levels and I do not have infinite lives. I am up to level 126 and locked out for the usual 72 hours - I thought solving the Tasty Treasure would unlock the level. Also the Tasty Treasure says the chest will get opened but this doesn't happen.