OK, first of all, i could not finish the game on easy diff, because of all the bullshit critical hits; this game has an awesome design, beautiful layout, good idea - ruined by fu&*£d up critical / attack of the AI. I mean seriously my hero dies from 1 hit? F$%k right off. 1/5 until fixed.
Sigh, I don't usually comment, but the tank level is extremely bad. Fix the damn thing!. 1/5 as could not be bothered restarting the entire game to choose the correct options on the upgrade tree.