War of the Human Tanks is a very strange Japanese title, localized into English by Fruitbat Factory, a company that specializes in doing so.
Its gameplay is somewhat Advance Wars-like, though unlike that game, it's not turn-based; instead, each unit has a timer and becomes available to receive orders when the timer counts down. Units have different speeds, of course, but this increases the tenseness of play, as you often want to react quickly when a unit at a key position becomes available.
Your units are "human tanks," apparently something like replicants, since you build them; but they have anime personalities of their own, and all appear as little anime girls in uniform.
Before each level, you select what tanks you will field; you can use ones that survived a previous battle, and build additional ones, although of course your resources are limited. You can also research new types of tanks over the course of the game. Each type has different capabilities, in terms of attack pattern, ability to recon and over what area, movement rate, and how quickly they become available between orders. Individual tanks can also be assigned mods that provide some additional capabilities.
During play, you select units and order them when available; combat is quite brutal, with both sides typically taking many losses before the level is over. The board is a grid, with layout that varies by level, and often with many choke points. The objective of each mission varies as well.
Unlike a typical wargame, in which units are simply a means to an end, War of the Human Tanks makes an attempt to establish an emotional connection to your tanks; each time one dies, there's a little cut scene in which she cries out, and, of course, they all look like little anime girls. Combined with a lossy combat system, this is kind of brutal.
Between levels, there are visual novel-like cut scenes in which both 'human tanks' and human characters appear; in some cases, these are interminable (particularly at game start), and only vaguely comprehensible; this is, after all, a Japanese game, and very much so. Some will find this an essential and charming part of the game's appeal; others will experience an intellectual discontinuity between the military nature of the gameplay and the goofy anime sensibility of the narrative.
It is however -- different in a strangely appealing way; and as a wargame, it is nicely designed and quite tense.
I will note, however, that you won't get a full sense of the gameplay from the demo alone; it provides only one level of play, and as an intro level, involves only combat, none of the construction and battle planning that's really at the core of the game. Still, worth a look, and likely worth purchasing if you're an Advance Wars fan, or simply like strange dojin titles.