Really good. Compact and gripping, as Andrew said. And brutal, as war is brutal. I though it was well written (especially as this is a translation from the original - Spanish, I think?)
Choices are very constrained - the player is railroaded through the narrative and nudged heavily if they attempt to stray from the intended path - but I think that works very well in this context. There's a certain nightmarish quality, of being unable to escape from a dreadful, preordained fate, that comes through strongly as the player is pulled through each chapter towards the though-provoking ending. I liked it a lot, and played through a couple of times. Good entry!