Certain genres more than others can be forgiven when they completely ignore the story or putting it aside so that in the end this turns out to be just an excuse to justify the gameplay and little else. The Tower Defense can easily leave the story aside without receiving many complaints, since they do not sacrifice the gameplay, why we are at war is not very important if the rest is fun, ask Nintendo, Super Mario survives with the same story to years.
Defender's Quest: Valley of the Forgotten does an admirable job telling a story that is worth. And if not interested by it and are playing purely by mechanical strategy game can rest easy because these games are as competent as gender. 8.8/10