Nice game you have here! It's more of a defense game than a roguelike, but as a concept I'd say that the defense genre incorporating more roguelike elements could lead to some very fun games. I really loved the tiles/art here, and the movement and gameplay felt very fluid. The "!" spot signals and other symbols over units to indicate confusion, enrage, etc., made the current situation very easy to "read" and navigate at a glance -- very user friendly.
I got a single-player win with each faction. Maybe the Lich/Demon King should come with a small party. The necro/shadowmancers seemed very overpowered. Once I figured that out, the wins became very easy. A way to drop or swap items would be nice, if it doesn't exist already. Collecting gold between rounds was kind of annoying, there wasn't much time to run to the front lines, grab gold, then run back to make new summons, *then* run to the new summoning circle to set it to follow if needed -- doing this once can last a whole round. That may very well be intended though.
I'd love to see what this could become if you continued to develop it.