itch.io

Just a word of advice for anyone reading through the comments with the same question-

I beat it rather easily by working only on the treadmill, and ABUSING the Dodge function (regenerates 10 stamina)

Essentially, I would use Dash for every attack, and when the option to Dodge or Counterattack appeared, I always chose Dodge. Using this method, I only had to attack it once, to beat it, but somebody else might have to try a couple times.