Yes, the Top Potion and Bottom Potion are indeed used to alter a character’s sexual inclination (dominant/submissive).
Each use increases or decreases the relevant stat by 10 points.
Originally, they were intended to be usable only once per character, but due to a possible bug, many players have been able to feed them repeatedly to adjust a character’s tendency freely. That’s something we’re still considering how to handle.
As for the map system, that’s admittedly a bit tricky. There are simply too many interaction points on the map, and marking all of them would clutter the interface.
That said, from Floor 6 onward, the system will improve: truly important interaction points will be highlighted with neon colors to help guide the player.
Regarding Floor 7, it was intentionally designed as a trap-heavy area to make it harder to rescue the test subjects. So please understand that the maze-like difficulty is specific to that floor by design.