This was interesting. I'll admit I didn't really play along with the game, in part because my PC setup really doesn't make it practical to use standing up, but I at least tried to imagine what it would be like. Probably my biggest suggestion is, if you really want the gimmick to be the physicality of it, then you might want to make the game itself less obtuse / more readable. There were a lot of points where I was confused what was going on, so it could be clearer. For example, I ended up losing the tutorial fight after winning because I didn't know I needed to click "Win." The stick-man, while the dialog for it is funny, is really hard to read, especially once parts of the arms are lost. And the actual fights were all seemingly trial-and-error until I figured out how that specific character's fights work.
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Thanks for the detailed feedback! Just wanted to note that losing the tutorial fight that way is a bug - I wrote it a little differently than all of the other fights, and all of them should give you as much time as you want to press "win" once you've won the fight. Sorry! EDIT 7/10: apparently I was wrong about this! Thanks to Walrusware for pointing it out on discord.
Also, just as a hint for you (or more likely other people) struggling with figuring out what to do in each fight: your goal is to click body parts in every fight! Some just obscure them better than others :)