hmm... interesting game, don't know how I didn't saw it on all these years; btw, someone could tell me, around, how many Monster girls are implemented already?
Beyond the girls mentioned already, there are also another 5 capturable girls who are sitting in waiting. All basic art assets are ready including conversation pose, outfits, etc. They just need their event art. On top of that, there's another 2 girls that have their design/pose done and just need some outfits and whatnot. There is also an additional non-capturable girl that is designed for a one-off event, and a new character story character that's halfway through the line art process for the next story update. That's not to mention that the writing team (including the guy above) has written multiple girls that don't have art yet.
Here a few images of those unreleased capturable girls that have been publicly confirmed already on Discord/Patreon
It's old images, so the centaur and sheep are already in the game.
Shark won the vote on Patreon so she goes in next.
Minotaur, Tarantula, Bat, Tanuki are the others that have all basic art assets done.
Cactus lacks a few art assets, but her design is done and a few outfits.
I don't have the last one in here, she's not public yet.