An interesting game, though the mechanics are inconsistent.
For example, if you change the clock, it changes time with it (or at least changes multiple clocks). That doesn’t make much sense, since the whole point is that you only affect the object you click on.
Logically, if you speed up only the clock, Tim wouldn’t be late, since if the clock runs fast, he only thinks he is late. And if you slow it down, Tim would be late because he wouldn’t realise that far more than 10 minutes have passed. But the game treats it like it’s the opposite.
So while the idea is good, the puzzles could be improved.