I'm a huge spaghetti western fan and this one took me back to the feel of those oldies. Sure it gets a little silly, sure it gets pretty bloody, and yes it is weird - but it was all part of the fun for me. It flowed well and took me along for the ride. They made a solid movie with hardly any budget and no stars, and with a great soundtrack too. That's impressive.
Some people seem to be complaining about its use of different tones that intersect throughout. Have you watched any of the classic spaghetti westerns?? They almost all had comedy, drama, action, violence, and sometimes even a little horror mixed in there. And I'll have to remind you that Bone Tomahawk was ladened with comedy.
It's unfair to compare it to Bone Tomahawk anyway just because that is considered by some to be a "horror western," and that's the only other one released in the last few months (years?). I read an interview of the film makers where they said Kill Or Be Killed was made two whole years before Bone Tomahawk even started. So there's no way they were inspired by it or even knew about it probably.
If you can handle the fact that it is an independent, and you want a fun popcorn movie set in the old west that tries something new and exciting for a change and isn't your run of the mill story seen 1,000,000 times (ahem, Forsaken, Jane Got a Gun, blah blah), this is well worth your time. You won't be disappointed.