This is actually a tough one, as most games involve dark themes. Even Monkey Island has ghosts, and almost all games involve death of some kind. It's hard to find bright and happy games which are still mature and not for children.
Two I would recommend, which are both great games:
-Wallace & Gromit: Light and funny adventure for adults, with moderately difficult puzzles.
-The AGON games. About a professor going all around the world to find a series of puzzles laid out for him. Not a shred of darkness here.
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