Junk Jack

Junk Jack is an action-adventure sandbox video game by Italian developer Pixbits, originally released on iOS in 2011. A sequel entitled Junk Jack X was released on August 29, 2013. Junk Jack X has recently been renamed to Junk Jack, and the original game has been renamed to Junk Jack Retro.
Gameplay.
"Junk Jack" is a 2D sandbox game where the player collects resources and aims to explore and survive in a randomly generated environment full of treasures and hidden secrets, filled with biomes on the surface and underground.
Plot.
Like all sandbox games, the game has no clear objectives and has no concrete plot; the player creates their own storyline based on their individual experience. However, Junk Jack X contains obtainable items to travel to other worlds, an action that the game strongly recommends players do.
Development.
The developer and coder is Jacopo Santoni (Jack), and the graphics/sfx artist is Silvio Eusebio (XsX). The pair met on multiplayer in Minecraft, and decided to collaborate on a similar game for the iPhone; at that point there were no iOS sandbox games.
Critical reception.
Junk Jack.
The game has a Metacritic rating of 85% based on 11 critic reviews.
Slide to Play described the game as fun and addictive, while 148Apps deemed it a must-own for lovers of the sandbox-crafting genre. Pocket Gamer noted that it had a high learning curve, but that it was enjoyable once the player eased into it. Multiplayer.it even said it was better than .
Junk Jack X.
The game has a Metacritic rating of 83% based on 7 critic reviews.
Touch Arcade noted that it added new features to the sandbox, and built upon its prequels success, without drastically reinventing the genre. Pocket Gamer reasoned that the game wouldn't convert non-believers to the genre. Gamezebo appreciated the extra easing-in the game does to help keep players who may have left "Junk Jack" due to frustration over difficulty.
At April 27, Pixbits released Junk Jack X for steam, but they have now returned the game to the original title "Junk Jack".