Robot Planet is a free 2D arcade game developed by odeean for Android devices. In this game, you play as Cogs, a robot sent to Cyber Planet to retrieve a piece of technology that can win a war. You need to fight robot enemies and collect items to unlock the path ahead. The game features a multi-layered 2D physics environment with many objects to interact with, pick up, and use later.

The game controls are unique, using the whole screen as a control surface in combination with hardware buttons. Alternatively, a screen overlay can be used as a substitute for buttons. The game provides an option to use cheats for those who need help. The game gets more exciting as you progress, with power-ups that involve a bit of thinking and hidden objects that can make things a lot easier.

Overall, Robot Planet is a personal work of art that comes from the developer's lifelong passion for robots that turn into other things. The game has hundreds of images crafted one pixel at a time and a huge amount of code. It is an engaging game that deserves a try.