The clock mechanic was a really creative and well thought out idea. I liked how you combined the story with the day and night switching mechanic.
A few suggestions that might help: I think some platforms and obstacles blend together a bit because they're at the same visual level, which makes it hard to tell what you can jump on and what you can't. I also think adding a sound effect when switching between day and night, as well as a jump sound, would make the game feel much more responsive.
Overall, it's a really great idea with a lot of potential. Congratulations, and great work!