This is a good idea, but this game has a few issues:
1. I don't know what the purpose of this game is, because after 10 seconds there is just a floor and i die.
2. The UI is way too small. Probably, the UI was originally not that small. You can fix the issue of the UI changing size by setting the Canvas Scale Mode to "Scale with Screen size" and setting anchors for the UI elements.
3. Don't use the standard Unity background color. It seems unproffessional.
4. Don't use the standard Unity font. Again, it looks unproffessional.
I hope my feedback helped you, it would be nice if you could check out my submission too. :)