This is a solid 10/10 conversion.
The fact it uses custom guns and not the awful default ones with equally awful sounds, already give it a point boost. Plus you can feel your guns can kill enemies. Took a while till getting the assault rifle, but alone with the pistol was enough to clear out my way. Also helped the case enemies weren't high HP bullet sponges to "give you challenge" like how newbie or even veteran mappers wish to do. They posed reasonable threat according to their position in the tier list. I felt the human grunts were kind of persistent tho, like they were almost the hardest to defeat, at some cases felt they just consume my bullets without loosing HP. Nothing terrible anyway, still could get rid of em with just a bit of tacticool work.
The mapping is topnotch, high quality, just the thing you'd expect from a Half-life mod/map. The ice themed monsters is a nice touch just enough modification to make them different from your average XEN refugee.
Also I pretty much beat it alone without dying even once, there were close calls but always could briefly retreat to replenish ammo, health & armor, since these maps gives you plenty of opportunity, even if it was 3 more people everyone could have enough. I assume map is survival compatible, I didn't tired it cause I hate that shet(thus disabled on my server). But this map probably could work quite well with survival mod.