The game is not difficult; however, there is an issue. That you simply did not put into the game. It's called "Variable Jump Height." You know how when you jump in most games, you can control your jump? That's what your game doesn't have. It makes your achievement difficult to do survival.

Classic hope to see a halloween version of this in this future!

so goooood... buuuuuuuuuuut aHDSHDGHGDSJGIFHUHIDSHGUFDHSUII SO HARD

As an achievement hunter, the get no kills on lvl 6 is literally impossible!. I can't move past lvl 6 until i get that achievement. other thing, music gets annoying after a while, reset with space? space is usually used for jumping so it gets frustrating when I accidentally hit it.

I said enough was enough.
I put on the song MeGaLoVania by Toby Fox.
Put on my headphones on max volume.
Opened the game after five years from my last attempt.
And I played to get the Survivalist medal.
And after an hour, I was victorious.
After all these years,
I have won.

A classic, one of the most fulfilling and fun games on Newgrounds.