Extendotron

I forgot to mention, you can also move left and right with arrow keys or A/D! Aside from that just follow the in-game tutorial. Chrome recommended for best performance.

Control reference:

• Click along ground or arrow keys to move
• Press Space or click on the robot's head to conduct repairs
• Press Tab or right click to enter upgrade mode
• Click and drag on upgraded parts to expand or collapse them
• M: toggle sound

Assets used

• Music: Getting it Done Kevin MacLeod (incompetech.com)
  Licensed under Creative Commons: By Attribution 3.0 License
• Fonts: Google Web Fonts
• Sound effects made with ChipTone by SFBGames