Terraria is a 2D platformer Minecraft style game where the player must survive in a randomly generated world through crafting objects. It costs $4.99 and has zero in app purchases.
The gameplay consists of starting in a randomly generated world where the player must survive by collecting objects that can be crafted into equipment and building materials. The equipment is used to protect oneself from enemies while the building materials are used to create shelters. It is an open ended game that has no specific goals other than survive.
Pro Has an extensive crafting system
The vast majority of items in Terraria can be used to create other items, often requiring specific crafting stations (which themselves must be crafted). This is the core of character advancement, since gear defines nearly everything about your character.
Pro Free demo for easy testing
A trial version of the game can be downloaded on Google Play. A feature of the trial version is that it does have a full game unlock through in app purchase, for those that don't want to lose their games progress by downloading a different version of the game.
Pro Survival-horror elements give a sense of urgency
Instead of building a deliberate feeling of suspense, Terraria uses bright palettes and arcade action to provide a fun experience outside of the survival elements. When those elements gradually appear one by one, each is all the more shocking from the contrast which makes for an ever growing sense of urgency in the game to craft a safe space as well as weapons to protect oneself.