In what way does your game fit the theme?
You have a slingshot capable of rewinding time for its projectiles. This fits the rewind theme. The game is built around said slingshot - the player needs to rewind time to hit geometry and thus get catapulted into the goal!

Did you write most of the code yourself and made all the assets from scratch?
The code is 100% written by me (of course, I did look at StackOverflow and the Unity Forums). I made all assets myself, except for the sound you get when you land in the goal. Technically, I made that myself, too, but I made it using Bosca Ceoil's integrated instruments, so I wouldn't say it's 100% selfmade.

I also used 2 fonts that are free-to-use. The licenses are included and can be viewed from the main menu.