In what way does your game fit the theme?
You are a tuber riding down the river. Other tubers will join you to help collect as many stars as possible. The more people you have the faster you'll collect stars and you'll be "stronger together" as a group.

Did you write all the code yourself and made all the assets from scratch?
All game code was written by me using Bolt visual scripting in Unity3D.
Some assets from Unity Asset store are used for art. All assets used in the project have been listed in the description and purchased by myself.