Pretty cool game, seeing heads fly all over the place is always entertaining :D
For an early version this looks quite promising, the visuals and characters model are nice and the general feeling of the gameplay is great, the bow felt awesome (and I must say, decapiting someone with an arrow, even though absurd, is awesome)
In futur updates I'd like to see a bit more dynamic combats (maybe give a penalty for blocking, and make ais try to go around, maybe dodges,etc...)
I think the strong point of this game is that it focuses on arena battles, and I think there's really something great there, if you can capture that kind of atmosphere, like the crowd cheering, boohing , the music and all. The crowd reacting to what the player does could be a big plus like "Come on, finish him!"
Can't wait to see how it'll evolve!