Before 0.1.6 i made it to Lv.51 in the actual Rebirth.
After 0.1.6 i couldn't kill mobs in the 40s. I had to go back manually to the 20s to kill mobs again. I could then autolevel back up to 48 only to die at 47, 46, 45, 44 and so on.
Seems like the Monster Level gets stuck up there. After manually going back again it was again playable. So i have to stop auto progress around 46/47.
Can you please try again? Things should be much more easy for the lower floors!