Insanely great expansion pack that does everything you could not an expansion would do in terms of building on what the base game (and it's older expansions) get right and get wrong, keeping the high points and adjusting the things that hold it back. The highlight is definitely the level design which is a huge improvement on the base game, there's a great amount of variety and creativity that makes every level memorable in a way the original game doesn't have. Ruined earth is a major highlight but I want to shout out corpse runner for while not being as aesthetically interesting has some really great moments that again is something the base game just doesn't have. The weapon selection is great, taking the best of the previous dlc and cutting out the lackluster ones and unlike the previous dlc it gets raising the difficulty right, it's hard for sure but never feels unfair, I think largely a benefit of modern game design. The reason I can't quite give it a perfect score is the final boss leaves a sour taste in my mouth, it just reuses bosses from previous levels in a very bland arena that just wasn't very fun. But aside from that unfortunate ending this is a near perfect expansion to a game I already loved.