Just like the greatest paintings
Unlike its model, TUS is more about thinking than running. The title is full of crazy and innovative puzzles (creating platforms, use of light to progress...). It also benefits from an amazing art direction with unique and beautiful sceneries like the one above. The story is entertaining as well, almost moving, and reinforces the mysterious and fascinating aura that springs from TUS.
True, it's quite short and the controls are a pain sometimes. But it does have a few challenges that add to the overall value for completionists. And think about it : you enter a paint shop and see a masterpiece at 7€, what do you do?