Yes, those are all 2d games.
No, I refuse your trash opinions.
1-Monster Girl 100
2-The Sword of Succubus
3-Snow Daze
4-Town of Passion
5-Unveiling the Unknown
6-HuniePop
7-Eroico
At this point you're just being petty with your ultra specific requirements for a game to be compared to StS: "completed 2d adult sandbox non-parody non-Japanese game that is not part of a series of games and has art of a similar level of quality". Come on now.
1. Monster Girl 1,000: TwistedScarlett again, she just pumps that shit out.: +1
2. Sword of Succubus: Not even close to being similar, doesn't meet requirements: -1
3. Snow Days: Pure VN, doesn't meet requirements : -1
4. Town of passion: Lower quality art, RPGMaker, doesn't meet requirements.: -1
5. Unveiling the Unknown: TwistedScarlett is some sort of psychopath, for real: +1
6. HuniePop: Vaguely meets my requirements in some areas, I guess.: +1
7. Eroico: Again, completely different game type.: -1
You got 7 now. 3 if we discount TwistedScarlett games. I'm being petty, but its to make a point. There aren't a whole lot of completed games out there that you can compare to StS. You can't say how long something like it should take to make, because almost everything out there like it, is also in the exact same boat: unfinished.
Lol... really? Went from "name any" to super specific requirements with your biased personal ratingsystem you're adjusting on the go real quick... hilarious.
For the "name any" pot: Paradise Lust
Paradise Lust is hella mid across the board, but I'll give you a +1.