So. I love Lovecraft, and I love WW1. I could hardly not play The Wasted Land.
Basically, the game is an old-school tactical RPG: your squad has action points (AP), moves on a grid-based move, and fights endless hords of German soldiers/cultists/abominations.
The usual mechanics you'd expect to find in a tactical RPG are here: your units will try to shoot at targets within range during the opponent's turn if they have enough AP, terrain and armor have an effect on how quickly your units are out of action points, etc.
Truth be told, this isn't the best game of the genre. The interface is atrocious - even upgrading or equiping your men between missions is a pain -, and the maps are more often than not too open and too small, meaning you usually can shoot at everything right from the start.
I'm also wondering why the developpers took two dark themes (the Great War and lovecraftian madness), yet decided to treat it lightly. The pulp/comic book tone isn't really fitting here, in my opinion.
But overall, given how cheap this game is, and how much, simple, honest fun I had with it, I could hardly not recommend it. It's not a masterpiece, but it is indeed fun.