This modpack was meant to be vanilla plus, but it might have gone beyond considering what you consider vanilla plus. This modpack will not become more difficult as time goes on like the parisites or infection mods. This modpack adds more weapons, ores, structures, and mainly mobs. In fact, the only goals when making the pack were to add as many mobs and weapons as possible and still have it seem a bit like Minecraft. This mod does not add any biomes as of in the original version, but you never know. If you don't want biomes just make sure to check changelog before using. I would say that depending on how you play, the game could either be much easier due to better ores and tools or much more difficult due to the powerful enemies and structures spawning throughout your world. For example, if you just hide a hole all night, you do not have to worry about the insane number of night mobs, but if you decide you want to risk it to try and get good mob drops or something, it instantly becomes more difficult. The player will have to fight harder to survive and hopefully get lucky and not be bombed. On that cliffhanger have fun!