Campaign + Campaign Overhaul

This addon alters the combine for the original game which makes them harder to kill. To use it subscribe and then in your headset check it to enable it. If you just start a new game picking this addon it will start a level where you can release different enemy to fight.
If you instead go to the original game and start it with addons enabled all combine will be very tough to fight.

There are also different versions of this same addon available.

Half Life Alyx addon by gereric_icon

https://steamcommunity.com/sharedfiles/filedetails/?id=2307067046