Dark World Stutter is broken. The line can move close enough not to trigger a hit in normal mode, but then trigger game over when it switches to the other mode.
It would be better game design to allow players to see their own hands during their opponent's turns in multiplayer. It would cut down on turn time as players would be able to strategize and would be able to look up how their cards work.
Challenge 9 = kill the 3 major revive threats: 2 shaman and elder shaman up front. You want these three dead and start killing their rangers before the main bulk of their units show up. The elder shaman in the back can't reach the trio in the front so you don't have to worry about him until later. Once the moving wave arrives curse them and let them start infighting. With some luck it is beatable.
Area 7's falling rocks knock a star or two off the rating. The objectives only taking one type of weapon (like tree stumps can only be cut with chainsaws, not axes) takes another.
Run around in a circle and collect powerups. Highest level with the best upgraded epic+ gun usually wins. Most players play at or below the level of a poorly programmed bot: just mindlessly chasing and shooting at targets well outside the range of their shotguns.
I feel like this game would be a lot more fun with keyboard controls instead of moving the mouse and hoping the whale moves in the right general direction.