First of all, don't be fooled by the appearance and the price. While hardly the stuff to make grogs drool, it's not the casual tablet game it appears to be on the surface. More beer-n-pretzels, but it can be quite challenging.
Every game is a random map made up of jungle, rivers, and 10 Vietnamese villages. US HQ is always on the Eastern border, the NVA starts from the West (Cambodia), and VC are out in the jungle on the Ho Chi Minh Trail somewhere.
Each village has a 'Hearts & Minds" value, and your score is the average value of the 10 villages. The goal of the game is to complete 45 turns with a H&M score above 50, as well as positive "political points" (think morale). PP's are the currency of the game and are spent every time you bring in reinforcements, repair equipment, heal injured units, lose battles, etc. You earn them by winning engagements. In an odd design decision, moving units also costs PP's.
Every time a VC unit enters a village, the H&M value is reduced. When you win an engagement, the value in the nearest village is increased. Should the H&M value of a village drop below 40, it is considered to be sympathetic to the NVA, and an NVA attack is launched from the West side of the map.
Units are made up of regular infantry, ARVN, Green Berets, artillery, mechanized units, and helicopters. In another odd design decision, Green Berets are among the worst combat units, used mostly for scouting and for training ARVN.
While combat plays an important part, the game is mostly about supplies, FOW, and keeping the H&M values of the villages as high as you can get them. The first time a Chinook ferrying much-needed supplies is shot down over the jungle you definitely feel the pain.
Highly recommended, especially with the price point of $10. My only complaint is that there are no non-military units like medical or relief personnel that could increase a village's H&M score, but I think that's beyond the scope of the game.
Available on Steam or directly from Matrix/Slitherine