I just got the 150 kill badge with a trackpad on my laptop. The easiest method is to kill the first fifty of so as they come as that's when it's fairly easy to keep up. After that circle the room and take out archers when they appear and when the sword guys mob together take your shots. This way you get easy multi-kills and it's relatively low risk.
This game is well made. Excellent controls, very nice platforming and everything just feels very natural. My only complaint is the lack of a restart button when trying to do speed runs. It would be nice to be able to just press a button on the keyboard and have it restart from the beginning. 5/5
This is the first hard badge I got totally by accident. Pretty fun, but fairly easy, I got bored and quit after 60 something and tried to lose on purpose. Needs a forfeit button. >_> 4/5