Of the 50+ I've rated so far, this is by far my favorite. I loved the idea of changing the values on the dice for the combat and buying weapons and such. It was really well done. Your UI and overall graphics were super clean and fun. Also, your music and sfx were totally on point.
The only issue I ran into was that on my second play through I got both the D8 weapon and shield fairly quickly and just zero-ed out every other dice - easy wins from then on... until I reached the champion with my D8 where every side is a 20, leaving he and I in an everlasting gladiator battle of perfect 20s forever. It just felt a bit too easy on the second playthrough and then the boss guy and I having a stalemate what a moot ending.
Otherwise, again, this is my favorite game I've played thus far. Really good job with this. I actually found myself wanting to make my own gladiator game after seeing yours! Nice job!