Clock app purple UI

This is my first ever UI work! I looked at my clock app and thought about how it could be transformed, so I did it!
I wanted it to be more flat and minimalist, and I figured that purple wasn't common in clock apps, which is why I went for it. I started this project on Illustrator and ended up redoing the entire thing on Sketch - using it for the first time!
There are probably dozens of things to change in this design and i'd be happy to hear how i could make it better. I know it's not the most exciting design ever, but i'm still pleased I managed to do it all by myself!