Spinning the axe needed some getting used to, especially after the length upgrade, but it was a great feeling to slash through a group of enemies in a single strike :D
The damage seemed to always be 5, regardless of the speed? I might have missed an upgrade, but the damage increasing with the speed by default would be cool. The arena was quite large for the amount of enemies, I had to search for the cyclops a long time...
Very nice mechanic and enjoyable game loop!