Excellent game. I read the Instructions after I got stuck. =) Perhaps put the instructions on the loading screen or put text in the background of the levels that blocks are introduced. 5 Stars.
Something small yet useful to add, would be if they were to add a Goal Progress to see how many more (e.g.) Heads you have to Decapitate, and I noticed even if I have 50 points in Dexterity my hit chance seems to be the same as my other gladiators who have 9-10 Dexterity, perhaps buff some things?
I skipped the tutorial because it was glitched, and I was hardly learning anything, then words on the screen saying you skipped the tutorial are blocking some of the gui, kind of annoying.