Ark of Charon is perfect if you want a challenge, but needs polish

Ark of Charon

Build a mobile fortress on the back of a giant and mysterious walking Tree and embark on a journey in this merge of tower defense and colony simulation.

In Ark of Charon, the tree of life has been consumed by darkness, and as it died, so too did the world around it. Golems, little goblin-like beings, tend to a newly emerged ray of hope; a seedling mounted on the back of a giant, walking tree creature. But the darkness that killed the tree is still out there, hunting the sprout, so the creature can only rest a while before it needs to move on, outrunning the dark storm. Tranquil base building and intense tower defense combine like the crests and troughs of an ocean wave. In the longer, calmer sections, Ark of Charon is a competent but uninspiring base building game. In the shorter, chaotic combat phases, it's fiendishly difficult, adding a layer of challenge that drives the game forward but soon proves overwhelming.

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