Half-Life: Xen's Horror is a Half-Life mod where you play as a guy named Ayden Farrell who discovers the lost facility named Orange Facility. A little more bio, Ayden discoverers some devastating and horrible experiments which gone wrong and with the collapse of the alien world Xen are making their way to the human world.
Half-Life: Xen's Horror is a mod about a unknown player who tries to escape Xen, but things don't go quite well. The player has to go through many dark hallways and complete puzzles while not trying to have an accident. The player barely sees anyone (other than enemies). What path will you take? That is up to you.
Still a lot of junk files. What has to be inside: 1 map, 1 model (not properly used on map, by the way), a properly set liblist.gam (no need to include dlls). Maybe + 1 new sound (I haven't saw it used on map) & maybe modified sentences.txt / skill.cfg / titles.txt (not sure if they have been properly set for using too). Also modified icons for Steam. Other files are just unneeded for the showcase.
Regarding the map itself - it has some "gameplay", but everything looks primitive & unfinished. Nothing good enough to show it on public. Except you want to get a criticism back.
Recommended liblist.gam changes (to get rid off copy/pasted dlls which can be unsupported in some situations):
gamedll "..\valve\dlls\hl.dll"
gamedll_linux "../valve/dlls/hl.so"
gamedll_osx "../valve/dlls/hl.dylib"
Alright