Sai

SAI Developed by Mutiny

It’s a third person action game exploring Celtic folklore and deforestation. Set in a magical forest, players will discover an environment damaged and destroyed by onslaughts of machines. These metallic creatures wreck their way through the land to get to the core of its magic, the Heart Tree. Though its presence is now but a lost memory, the machines remain, determined to find this all powerful entity. As a Druid, protector of the natural world, you must explore this beautiful realm, harness the power that still lingers here, and uncover its dark past. Stop the machines. Protect the land. Save the forest.

There’s not much to go off of with this one, but it’s graphics and the environmental message behind it make it worth the cheap price. There may be some adaptation potential as conservation is always a hot topic, but it would take a bit of world building. The simplicity of the premise sinks its teeths into you.