Here, let me end the argument. Levels need obstacles that kill you. Without them, you're removing the main component of the game... the risk/reward factor. The point of the game as far as I could tell was to consistently challenge the player with increasing challenges created by the clever use of obstacles. When you remove this, you are just walking and jumping without any care to the games purpose. Granted, playing around with such things can be fun for some. I personally do not find this fun and couldn't find it in me to even try RockLeeSmiles free climb level despite it still supposedly having a challenge to it. Just seems fruitless to spend time trying difficult jumps if failing means just having to try them again. I realize this can be utilized in a way that failing starts you over at the beginning as it was in his level, but eh, not for me. I like the death factor.
So if it's not sawblades, then it's salt, lava, lazers, eyebeams, maggots, mutant flies, zombies, rockets, demon maws, spikes, etc. Just please use something to add the element of cause and effect or I will complete your level intentionally to down vote it. Now stop e-slap fighting over something stupid.