Welp, I found a winning strategy. Staying in a corner, waiting for the other to throw themselves at you, then avoiding them so that they fall out on their own.
The concept is effective. But I’m not sure what the spinning does? At first I thought it was the only way of moving (I didn’t read the description and was only using arrow keys :p), but then I figured out I could also move around without spinning, and the inertia felt the same. Also the close camera makes understanding the space around us difficult. I didn’t immediately realize I was moving in a 2D space, I thought for a while that there were some walls coming at me. x) But once evrything was understood, playing with the physics is pretty fun, and there are actually a lot of ways to trick other players kick them out of the arena. Nice job!