Random Pyramid Defense: pixel is a mobile game developed by sunghyunpark, available on Android platform. It is a sequel to StarCraft's popular Use Map Random Pyramid Defense. The game revolves around testing the player's luck and judgment.

The gameplay involves combining three identical shapes to level up, defeating enemies and earning gold. The game ends if there are more than 80 enemies. The player can choose one color and upgrade it, and change other colors to upgraded colors. Only 2-level shapes can be changed. Whenever the player breaks through a certain round, they receive a reward.

The game has simple controls, where the player needs to touch and drag to overlap three identical shapes, drag a shape to place an enemy within the attack range to defeat them, and touch a 2-level shape and press the Change button to change its color.

Overall, Random Pyramid Defense: pixel is a game that tests the player's luck and judgment, with simple and easy-to-use controls. However, there is no information provided by the developer regarding the subcategory of the game, and there is no need to contact the developer for feedback or suggestions.