Not really? To my knowledge you kept your game progress after defeat. And thank god for that, because at least for me that game is hard. I generally define roguelite as games with perma death, but have upgrades that you can permanently unlock that make you stronger the more times you play the game, a recent H game example is Succubus Heaven. I wouldn't say any of those games mentioned are roguelites, though MaidenSnowEve is kind of similar to a roguelite, you never truly get a gameover when defeated, just lose progress and gain sex stats.
I think MaidenSnowEve is the best game to play if you're sad that DnP never met it's potential. But it was already mentioned.
I'm pretty sure this is the difference between a rogueLIKE and a rogueLITE.
DnP and Maidensnoweve are in that vein of mystery dungeons (For non-h games, think the pokemon series of mystery dungeons, shiren the wanderer, or azure dreams) which are kindof a metamorphosis of
old roguelikes, which are -Like- Rogue, a very old dungeon crawler, (i can't recall if it's actually the very first one). I think they all have been encompassed into Roguelikes, though those in particular are a bit on the "lite" end. More traditional roguelikes would be something like Caves of Qud, Stone Soup, Angband, Portalis, or Tales of Maj'Eyal... with permadeath turned on if they have the options.
Roguelites, though, have been blown up, originally being similar to rogue, but not having permadeath or making other aspects of it easier, thus "lite".** However, it's been expanded a lot to mean a game you can die rather easy and unexpectedly, but is "lite" in that you can carry over something between playthroughs, whether that's perk points for bonuses, or equipment in a safebox, or whatnot. For example, Rogue Legacy or Spelunky for platformers, The Last Spell for tower defense, Vampire Survivors for bullethell, or Dungeonmans for more traditional
TBH, a main point of H-games involving losing to get the scenes, is compensated for in DnP and MSE in that you don't "die" or "gameover" you just get literally fucked, and then get back up.... to find out you're fucked again because the game stole all of your equipment and maybe scattared it near you, and also whatever spawned near you is horny and now you're naked so maybe it's a bit worse than just dying and loading the save.... but i digress. It's a discussion that could be had on placing them in roguelite or not, seeing as how when you lose all of your equipment, you may as well just load a save... Though i think even that makes it Lite, i think rogue and similar games at the time ran on permadeath modes only with no other option.
**a big improvement, because as i hear (because i never actually played original Rogue), rogue is hard as fuck, and RNG chaos on top of it, to the point where it cna literally generate an unwinnable labyrinth, and you won't know it's unwinnable unless you check every last tile and wall in it
But to the question of if sinisistar is a roguelite or not, i suppose it'd be if you got things carried over from losing into the next attempt. I uhhh, i tried sinisistar once... my
preferences didn't quite match up enough to play much.