itch.io

That I do not know, sorry. The dev will be unavailable until august so I'm trying to answer any questions people have in the meantime, but I never asked about saves in the browser version. If anything, playing the downloadable version is usually always better.

Yes, NSFW option is only on Itch. The scenes are accessed by playing through the game, they are mostly on Day 2 and two ending scenes are on Day 3. After you get them, you can rewatch them in the gallery.

So far it seems like everyone who plays the game has one particular fight they get stuck on, and it's different for everyone.  I can recommend stacking parries to get the multiplier high enough to defeat him in one turn, but if all else fails, try to swap your artefacts!