Well, did not expect that response.
How do I use it? I got recommended by a friend to start using it to improve upon the imaginative side of game development and for the last 2 years, I have made over 30 projects, some publoshed on my game's page, some experimental, then got inroduced to many famous developers I always looked up to, met tons of new people, got lot of attention, downloads, reviews and Markplier played 2 of my games. I even got motivated to learn java and in 4 months got a job with decent salary. In short, it works lol.
I don't know about Copper Cube 6 being horrible, but I guess it did not work for you. Its okay. I never force someone to use this engine, but if they are interested I give a solid yes.
Anyways, good luck to you and your friend.
Edit: Hope to see something new made in a different engine 😊