the shield at level 2 does last a rediculous amount of time. not sure if it is intended or not, but until you get the first upgade of each bonus item, besides the shield, it will never come into play. the kill 90 minions achievment doesnt work at all even once u get it to 90/90. aside from those quirks, it was really fun! shield made the game pretty quick to win though. for those complaining about burrito bison, there are many differences to it. that game doesnt own this style of game play :P