Plain gameplay delivers a mess of physics and timing through a simple thingy. It is a total chaos that i find oddly addictive.
Clicking starts the match, you punch with a single button.
Controls are just one button for throwing punches. The main mechanic is timing and physics, and obstacles are not stated.
Most hits come from waiting for the right moment. The single button needs good rhythm for the main mechanic.
Q: What are the controls? A: One button for punching.
Q: What is the objective? A: Land hits on opponents.
Q: Is there a timer or hints? A: Not stated.
Q: What is the main mechanic? A: Timing and physics.