Damn, what a great little game. Here are some thoughts.
The dev managed to add multiple gameplay sections without feeling like padding, grinding, or tiring, and it's actually enjoyable. This is how you add gameplay to an RPGM game. I honestly think you surpassed monotool. As much as I enjoy their games, they feel kind of dull; this one has a lot of personality.
I think the breaks in-between each level are great, especially the unique "bypass events" before heading out to the bathhouse. Special highlight to the "wallstuck" and "gaming" ones because those, alongside the "find 3 keys," being the only events that make the porn and gameplay seem, both happening at the same time. This is the pinnacle of H-game design.
The only downside is the lack of narrative, dialogue, and characterization of the protagonist. Some added writing could have expanded the length of the game and added a lot more eroticism value to the game, but I accept this might be intentional due to the arcade nature of the game.
It does bother me how the protagonist doesn't change; she seems mildly annoyed most of the time and sometimes in ecstasy when the scenes go on for too long. She just accepts the state of her situation, which I think deflates the overall erotic atmosphere. She is getting train after train and doesn't even have a position about it? It might have been intentional, but she doesn't strike me as the kuudere type, she is quite expressive in a number of situations. Maybe in the sequel we can see more development in this department. She reminds me a lot of Yuuka from Amazon's games, but without the writing to support it.
On a very subjective note, this game appeals to a very particular kink of mine which I wasn't expecting at all to ever see being done intentionally ever. I'm talking about how often scenes end with cock focus, usually even hiding her pussy. That is on top of the game being 90% interracial scenes. Star did align and I deeply apreciated, hats off to you, Dev, you are not alone.