After the suicide runners are introduced some of the enemies flicker between all three human types. Unsure why and its one hell of a decent distraction.
Also the first upgrade menu might need a little work, it's confusing as some of the text is cut off and there's four boxes with levels in and only two of them seem effected.
Also i have no idea what the mages actually do. The archer is the only one really aiding me as far as I can tell.