Don't know how long it's been at 50% off,but it's description is this:
Explore the island, venture into dark caves, and encounter terrifying monsters. Featuring randomly generated worlds, crafting, building, and mining, the world is yours to shape and explore.
•Completely unique, randomly generated worlds to explore
•100+ items to discover
•Craft tools, items, potions, armour and much more
•Fishing, farming, mining, building, fighting!
•The threat of starvation is always imminent
•Lots of monsters and animals
•Stunning pixel-art graphics
•Full day/night cycle
It reoeves very mixed reviews,but ooks kind of cool I suppose if you like retroesque graphics.