i like the fact that u can draw more strikes at once. it makes that first boss look so epic when u just go ape sh t on him and he cant do anything about it XD
for the undead tiger boss, have a fast and weak unit like the goblins. u need a unit that regens fast so u can stall the boss and make sure he doesnt move. most of the time it works, but also some ranged and some epic units maxxed out
there should be multiple heroes to play in battles so u dont need to rely on that one hero to stay alive or ur screwed. or just have castles to protect