Having played Terraria for a while, I can say that I do enjoy the game. A part of me would like the chance for a Terrarian-style planet to generate with the respective biomes (Forest, Jungle, Corruption/Crimson, etc.) that a normal Terraria world would generate, but on the other hand I have to wonder if that would be a good idea. Sort of like a mission unique to every character you create, you could visit this Terrarian world that starts as a threat level 2 planet, and rises with each boss you beat (or just upgrades to tier 4 after Wall of Flesh, tier 6 once Plantera's been defeated). However, I realize that at that point, this would just be near remake of the game for a lower price. I like the idea of this mod, I just don't know how far it can go though. Would be interesting if at least Lush planets could have the chance to spawn a random monster like Eye of Cthulu once you reach a certain max health and defense milestone.