The Inventions Buffet costs 46 euros per person and the price does not include any beverages. However, there are plenty of characters that visit your table (Mickey, Goofy, Pluto, Chip & Dale). I had dined there on Aug. 9th and had a wonderful time. You can also order a birthday cake ("gateau") for an additional 22 euros if you are celebrating a birthday. (It's a small chocolate cake with chocolate icing and candles).
From what I recall, there were plenty of appetizers (cheeses, thinly sliced cold meats), salads, mounds of cooked shrimp & crayfish, hot foods (lamb chops, carved meats, mini-burgers, fried fish, frites in the shape of smiley faces, pasta with sauce), fresh fruits like canteloupe and strawberries, and desserts (various cakes and sweets, sherbet pops, ice cream cones), and candy.
Hope this helps.