Deep Rock Galactic

So I just found out this game exists and have to admit it looks cool and fun. I'm just wondering what is the game about, I mean what's the purpose? Is it just fighting waves of enemies and trying to survive or is there another goal? Do I collect new gear, items and improve my character?

Also is it friendly for new players? Will I struggle at the beggining and get discouraged?

I could get it for either PS5 or PC, does it make a difference?

Is it worth it?

Edit: spelling

Edit 2: again big thank you to everyone for ur answers, based on what I learned im gonna buy this game as it sounds like something i will definitely enjoy!