Lol 2nd run of rebirth and it was prob my most OP run ever including 200+ hours of the original. Played Maggy, turned into Guppy by Caves 1, plus got an upgrade that I think made my blue flies bigger/stronger (plus Guppy's head every room), plus Monstro shots and choc milk. One hit mom, one hit the heart, binked a devil room and one hit the first 2 forms of Satan, form 3 took 3 hits though :P Only managed to get flawless chieve on Caves somehow though
Sheol seems like it will be no joke when not OP though...even on normal.
Agree the darkness is a bit much at times, and I get a little tilted by the fact that the game seems tailored to a controller instead of mouse and keyboard, but am pretty blown away overall so far. Save function is so amazing.