You do know you can upgrade your charecter with improved abilities and weapons right? And change the color in the main menu. Also, here is a copy & pasted list of ways to kill in an earlier response. I believe you will find MORE then 3 ways:

" Back stabbing is only 1 way to kill! You can also lay mines, and push them into them, spear them from behind ( or the front! ) while they are snared in a leg trap, trap them on a circle with a buzz-saw, trap them on a circle that releases spikes, blow them up with a button trap, push them into local spikes ( the 3-holed ones ) trap them between another enemy and you, spin them around with a gust of wind, instantly kill them with a rope-dart attack and drop down on them from another circle! "