@WyldRage
Trust me, NG+ makes you rethink your whole strategy, everything you have learned will not be enough to survive further down NG+. Just do yourself a favour and go fight Tower Knight, see if it's as easy as you think :)
@marciosmg
When you hit the vendor at 2-2, did a small orb near the right top corner of the screen appear? That's the auto-save sign, if it had appeared, then you're screwed with that vendor :P
@CrazyHorse
The Red Eyes are really painful if you aren't very careful, they are the most damaging normal enemies in the game, especially when you reach 1-4. The Giant Depraved Ones in 5-X are also very damaging, but they attack slow, thus not inputing as much damage as the red knights.
Of course, their damage is nothing compared to a Black Phantom Black Skeleton, even his normal hits can OHKO, and he's pretty much like a very hard Boss in terms of difficulty to beat.
Current PC Build
CPU - i7 8700K 3.7 GHz (4.7 GHz turbo) 6 cores OC'd to 5.2 GHz with Watercooling (Hydro Series H110i) | MB - Gigabyte Z370 HD3P ATX | Gigabyte GTX 1080ti Gaming OC BLACK 11G (1657 MHz Boost Core / 11010 MHz Memory) | RAM - Corsair DIMM 32GB DDR4, 2400 MHz | PSU - Corsair CX650M (80+ Bronze) 650W | Audio - Asus Essence STX II 7.1 | Monitor - Samsung U28E590D 4K UHD, Freesync, 1 ms, 60 Hz, 28"
