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(-1)

Just a FYI, but if you implement achievements on the Steam version you'll attract more customers for sure. I know your focus is Patreon/Itch.io, but think about it maybe.

(-2)

It's a good idea, but unfortunately Steam doesn't allow achievements for +18 games.

Is that a new thing they've done? As I have several 18+ games that have achievements, Treasure of Nadia for example.

(+2)

I'm not sure where you got this information from, but there are plenty of adult rated games on Steam with achievements. So - if you're really interested - might be worth investigating ;)