The farm comp is you picking characters that can give you loot by doing something. Greg chops down trees, and Maivis harvest the carrots, to give you loot. Trader gives you 1 gem for every 15 coun you get. Hopes this helps
Game feels alright. I think they did do a good job with they complexity and depth of the game, but I generally don't like Battle Royales, and it feels like its going to be even more frustrating than Clash Royale at high level play. I also don't like most of the mechanics that make it somewhat p2w, but the progression rate doesn't feel as bad as I was expecting so far. Player combat is interesting, so still formulating my opinion or that. Sometimes it feels impossible to run away, and sometimes it feels impossible to chase. You can definitely get screwed over by players going stupidly aggro at level 1 though, just like solo showdown in brawlstars. Even if you survive, you just play the rest of the match from behind.
