I like the game!
I did run into what seems like an endless loop, however. I didn't write down the names of the girls, unfortunately, so hopefully this will be coherent. I followed the path of the gal you meet in the stretching area through her shower event, then completed the path of the gal in the weight room through the park, got the text from her, and completed the scene at my apartment with those two. They had then disappeared from the gym, so at that point I went to reception, had the first conversation with the receptionist and the first conversation with the two ladies on the couch. I followed up with the first part of each of their stories (fixing the plumbing and becoming a blackmail victim). At that point ... nothing. None of the ladies are in the gym (except the receptionist, who doesn't have a conversation option), no one answers at either of the two houses, no one is at the park or cafe, the waitress is (understandably!) mad at me at the restaurant, no one texts/calls me wherever I go, sleeping doesn't change anything ... I know from previous playthroughs that there is more available with the couch ladies and the receptionist, and the weight room lady mentions that she'll text me later, but nothing activates. It feels like there's either a missing trigger for an event, or there should be a game completion. The only way I'm able to "advance" is to go into the ladies' locker room and get that "bad ending".
Anyway, well done otherwise! I've never done a game like this, but I've done enough code-writing to understand that you spend FAR more time debugging than anything else; hope this helps find something!