I see.
I can't read 日本語, but from what I understood looking at the developer's blog, he started dev (or started blogging) around 2014, showing off the character currently used at the end of 2015 / early 2016. Bloodstained was imagined in 2014, went into kickstarter/development in 2015.
However, Bullet Requiem was the game that came out before Bloodstained's existence,
not this one. This one started dev in 2016, and appears to have first released a demo in 2017. I just saw the 2020 date on f95 and didn't bother researching anything until now.
So, technically, Bloodstained came first, but this has been publicly playable for 2 years longer, albeit completely unfinished.
Regardless, my point about the
gameplay still stands: Bloodstained is far superior.. even though personally I felt like it was quite average compared to something like Symphony of the Night.
Also, another platformer H-game similar to the ones I mentioned is
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.. but it's uh, made for furries.