I am not defending Dani or anything but
I do not even know what you expect going on here...
You are just a average Troll. I played the game and can aswell say its far from perfect, you are just shitting about the game out of boredom. I do agree that stuff like :
"Well then make your own game" is stupid, but this case is a bit different.
The optimization is fine ,it runs kinda well on mobile .
i have a Nvdia GTX 1050TI
i3 -7100 and it runs pretty smoothly
Seems like it specifally your problem ,something with drivers or stuff maybe?
Unity does have many problems such as :
Challenges in achieving clean code and architecture using Unity
Bad UI implementation
Difficulties in applying SOLID principles in Unity
Threading in Unity
And etc but tbh engine is more of a tool overall
and every engine has its own pros and cons
Dani is just more comfortable using unity compared to other stuff
and there is nothing wrong with that
The graphics is fine ,its just a asset rip off tbh with sometimes too much post proccesing