ah thats sad.Have u tried Ayura Crisis and eris dysnomia? They are kinda open world with stages, although the sandbox/open world element is very limited compared to this. There is also Ep Battle girl/doll/hero games. I really love them for their sandbox/open world, but it might not scratch ur itch.
Also Flipwitch was good and was def an open world, but didn't have as much sex as i wanted. The gameplay was awesome tho, and the sex scenes were great but I don't really consider it a sidescrolling sex game unless the sex scenes happen on the map, and not in a separate scene. Still a great game tho.
https://f95zone.to/threads/ayura-crisis-v1-18-above-a-damage-tile.22288/
https://f95zone.to/threads/erisdysnomia-final-above-a-damage-tile.121557/
https://f95zone.to/threads/ep-battle-girl-v1-09-fuyou.101023/
https://f95zone.to/threads/flipwitch-forbidden-sex-hex-v1-5-momogames-critical-bliss.182148/
Also all those games are Pixel animated just a heads up. I like it but I know its not everyone's cup of tea. There aren't really any "great" sidescrolling games that have just regular 2d art like Scratch games. Like I just thought of Sinisistar but that one is also pixel. My hard recommendation is def gonna be the ep games tho, its basically Cosmic Abduction, without the sci=fi and dialogue but also has some action rpg gameplay/Puzzle solving.