I seriously don't know how to properly explain this, but I love/hate this game so much. Leaning a bit towards the former, but it is a mixed bag that does offer a unique flavor to those with the palette for it. Spoilers ahead.
As the description implies, this is kind of a rouge-like RPG, where you go in, gain a bunch of stuff, but then return (either willingly or knocked out) with all levels/stats gone. Interesting in concept, poor in execution. The first half hour of playing, I absolutely hated it. It was pretty much just pressing right, random event, and if it was a goblin (which you cannot escape btw), then I die in 1-2 hits with random enemy crits, making virtually no progress being made. And thus the vicious cycle continues until I run out of gold or give up.
However, once you buy the Extra Essence Bag to increase your EXP during these runs, thus increasing your chances of surviving a single enemy encounter, the ball starts rolling. Soon you're acquiring enough gold to buy the Cross Slash, run into the bandit enough times to use receipts in exchange for Bind and Stunning Blow for 100% guranteed captures- and the game breaks from there. Not literally, but in the sense that you go from taking consistent L's to winning every single encounter the exact same way, so long as you pass the Agility check. The snowball continues as you gain Mating Press in Map 2 (aka free infinite level ups you can spam even with 1 HP), items like the Nip Ring (free MP restoration) and Noble Armor set (increases gold farming), then eventually gaining the ability to have your base level remain at 10. At that point, the only real threat is the final challenge, where you'll need to really bolster those base stats.
Plot wise? I actually don't remember. Something about becoming stronger overtime by cumming in Lilly, the demon goblin, womb and fucking as many other female creatures to become stronger in base form? You beat a few bosses, help a couple of folks, and then take on the final bout for the ultimate prize ending. And then there's like this whole story involving Mr. Knight and his past lovers?
After you encounter all of Lilly's CGs and the 33 creatures/events (6 of which having 2), that's pretty much it. Which is a decent amount and the art is good, but rewatching some can be hard to enjoy. Either due to the giant text boxes obscuring the view or animations going way too fast to really enjoy them. Some of which actually becoming worse in the gallery view, as some are the full dialogue scenes, while others only have the animations that finish in like 5 seconds.
Yet despite the very unbalanced nature of the game and varying quality in CGs, I kind of liked it and winded up playing for 6 hours plus seeing everything it had to offer. Did I enjoy all 6 of those hours? No. First hour stunk, and the last 2 hours were a total grind, but the other 3 was honestly pretty entertaining stuff. I think.