The spearmen are not weak. The first win is easy. Just upgrade defense twice then push. Send first wave, Ice bomb for slow, regular bomb for knockback, and the first wave will most likely have them on their doorstep. Then just spawn more waves and use their ability to smash the front line hard. My fastest wins were with the spearmen.
The graphics are much better and the new cards are nice. I'm not a fan that you took the music from Seven Kingdoms and used it for the japanese battles.
 "Bit Battles"){kind=icon}
 "Castle Wars 2"){kind=icon}