So there has apparently been an update, the game is at v1.5 now. The patch notes on dlsite read:
● Genocide mode
● Addition of back boss and H animation
● Goblie lizard naughty
● ED branch by favorability
Blogpost can be found here:
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This is machine translation, so take it for what it's worth. Seems to me like there's content to be seen though.
Also something I found interesting, while randomly reading the blog they apparently posted a picture revealing the location of every single capturable NPC. Here it is:
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(I did try to embed it but for some fucking reason it keeps saying the format is invalid or some shit, so have fun with a link instead)
And finally, they claim that next update will add English support. Overall good news!