Nothing like a little robot-on-robot violence, right? Kongregate's newest game on Android had a good run over on iOS and the name tells you pretty much everything you need to know about it – Endless Boss Fight. You fight bosses, endlessly.
Your main character is a little punching robot that has to do battle with big, heavily armed robot boss machines. You duck, weave, and punch your way through one after another until you lose.