Really great idea! I love the randomized modifiers, the little slot machine was very satisfying. I would've liked a bit more to the combat, I was a little confused how an attack was blocked or not, and the arms on the gladiator are a little wonky but it has charm :P
I was able to back out left past the edge of the map, I think an end wall to make it feel like a true gladiator pit would add a lot there. Good work, would really like to see this one expanded in the future!