Can I offer some feedback? It feels a little bad that you basically get the same win reward for 4 wins vs 5 wins. Maybe add a small amount of gold to 5 wins so you get more than just the join fee? Other than that, great work, the cube itself has been very fun!
This is a bit of feedback that I've seen a few times and that makes a lot of sense! Gems are technically more valuable than gold, since they have better buying power in a few situations, but you need to be hyper fluent in the Arena economy for that to feel like it matters very much. For many other players, it's kind of unsatisfying. We'll certainly be taking this into account for the future.