The first map, we want to add more to this soon, so it's not 100% finished.
Installation instructions: Move the BSP to the Half-Life 2 Episode 2 'Maps' folder, located in steam/steamapps/common/half-life 2/ep2/maps -- Then run HL2EP, open the console and type 'map hwndu' in the console.
It can be played in Garry's Mod to use in multiplayer, too, but, when I tested this the AI had some problems functioning in Garry's Mod.
We're open to suggestions, so if you'd like to contribute, feel free to enter our discord. Discord.gg
If you made a mod it will be cool.