Add a pause button and a toggle for the music, reevaluate the cost for some units, that's really all this game needs. A Fast Forward button would be nice too. Since the "arrow cheet" doesn't work against demons, I'd suggest leaving it in for the other players. It won't really dampen the fun of the game.
The most irritating thing is it soesn't save despite there being a "load Game" option on the screen. Note to the creator: Don't put the Load Game option if you can't code one into the game in the first place! Over an hour of useless time waisted!