This modpack was originally intended as just a compilation of mods me and my friend likes, so it does not have a theme. This lack of theme also resulted in it having a bit of everything.
Some of the things offered by this modpack is: -Space exploration(Ad Astra) -Several new dimensions(Deeper darker & Twilight Forrest etc.) -Ability to build complex contraptions(Create) -FE generation and usage(Mekanism & Create Crafts) -New bosses(Mutant Monsters & Mutant More etc.) -Improvements to vanilla structures(YUNGNICKYOUNG|s mods) -New overworld animals(Ecologics & Alex|s Mobs) -Improved end(Enlightend) -Some quality of life improvements(Ore Excavation & Appleskin etc.)
All in all this modpack has a lot to explore and figure out and some mods that make that and the base game more enjoyable and less frustrating.