A job task : Projectile Motion

Hey friends, I don't know this is the right place to ask this but I want to ask :D. A few days ago I applied for a job and we interviewed then they want to a study-case, simple Projectile-Motion(or you can call horizontal shot in physics 1) mechanic in Unity but I can't use static variable, class, singleton pattern, Unity physics objects(Colliders, Rigidbody etc.) and other 3rd party frameworks or plugins.

They also asked me to do these things: Pooling System, UI, Camera rotation and movement. Click and spawn. Click and move to where I click.

And I did this

https://github.com/kakassss/ProjectileMotionRemake

its not that realy long code. They didn't want to work with me and also didn't give me feedback about my code. So, I don't know what is right or wrong about my project. I want to learn what I don't know. So, I'm asking what should i do? what is wrong about my code. Any idea, suggest or someting else would be awesome, thank you.