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The new version introduced a lot of fixes and improvements compared to the original release of 2021. So if you didn't quite like the old HL: Delta, give another chance to the Delta Particles and you may change your opinion.
Besides the long campaign the mod has a lot of contents personally produced by the author (models, textures, sounds) which create its own unique style. At the same time the mod evokes some nostalgic feelings similar to sensations I had when I played mods at much younger age. Delta Particles is made with love, inspiration and hardwork, and it shows through the whole mod in both little details and overall design.
Entropy: Zero 2 has everything that a Half-Life mod enjoyer needs. New game mechanics, new weapons, new enemies and new NPC behaviors. Decent level design, many memorable events and locations that I enjoyed exploring.
Pros:
Overall I enjoyed the mod. The visuals are great, the environment is carefully detailed and there're many scripted scenes to build the feeling that the widescale battle between humans and aliens is going on in the city.
Cons:
The main issue is design inconsistency. The valve can be interactive in one place, but the same looking valve on other map is just decorative.
Also the mod could use more visual hints on interactive objects as some levers/buttons/valves/crates are really hard to notice. E.g. I stuck in the hospital generator room because I couldn't see a lever.
Another small issue is inappropriate re-usage of some Poke646 assets, directly related to Nation City (which is in Germany) while judging from posters in the hospital the mod is set in United States.
Dark gloomy atmosphere yet a bit of humor in some places. A lot of interesting level design decisions which you probably did not see in any other mode. Many epic scripted scenes and views. Wise re-usage of original voice lines and animations. Feels and looks really fresh.
Interesting level design, huge halls, smart usage of darkness, a bit of horror. Great mod.