Gamezebo appreciated the extra easing-in the game does to help keep players who may have left Junk Jack due to frustration over difficulty.

Pocket Gamer reasoned that the game wouldn't convert non-believers to the genre. Touch Arcade noted that it added new features to the sandbox, and built upon its prequels success, without drastically reinventing the genre. The game has a Metacritic rating of 83% based on 7 critic reviews. It even said it was better than Minecraft: Pocket Edition. Pocket Gamer noted that it had a high learning curve, but that it was enjoyable once the player eased into it. Slide to Play described the game as fun and addictive, while 148Apps deemed it a must-own for lovers of the sandbox-crafting genre. The game has a Metacritic rating of 85% based on 11 critic reviews. 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. The developer and coder is Jacopo Santoni (Jack), and the graphics/sfx artist is Silvio Eusebio (XsX).

However, Junk Jack contains obtainable items to travel to other worlds, an action that the game strongly recommends players do. 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. 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.

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