I'mm'a be real, having to fail on purpose to try the potions out doesn't make much sense gameplay-wise and "lewd-wise", I made like ten potions and spent half the time trying to figure out how to give a potion to the cat to try to get to see a lewd scene as like three customers came and went while I wasn't looking. I was clicking the potions in the store tab, clicking her, trying to drag the potions, nothing.
I also don't know if I'm blind or whatever, but the only reason I knew I missed customers is because of the reputation dropping. If there's an audio cue, I would've missed it, I wasn't playing with sound on.
When I DID catch a customer in time, I just sold her a random potion because I had no idea what the heck she meant by "stamina potion" when the game hadn't mentioned anything about which potion's which, and they were all green, so I assume maybe they were all stamina potions?
Also the game adds a new icon to the notifications on Windows that doesn't close when I closed the game, which is a bit spooky.