I don't usually give sandbox games a chance, but I really like the characters in this one. There are many many many continuity errors, though, as a direct result of being sandbox. One example is if you do all the current Margaret content before the first Trixy event, she still says she's a virgin, despite having already had sex with her.
If Slim would just nix the sandbox entirely, and put events in their proper order as a VN, these errors wouldn't happen. It'd also cut down development time by a massive amount, since sandbox requires easily 10x the coding. In my opinion, sandbox adds nothing of value to a game. It slows development, causes continuity errors to be much easier to make, and makes the gameplay far less fluid. Having to constantly be clicking/tapping all over the screen ruins the flow of the story, not to mention having to stop mid-scene to go play a dumb minigame to make money to continue the scene.
This game would easily be a 5-star gem, if not for the sandbox aspect. That said, the girls are mostly worth the extra hassle.
P.S. Mao and Nao's voice actresses could stand to learn to pronounce their own names properly. It's pretty irritating that they mispronounce them so badly, considering how often they say them. Their characters are meant to be Japanese, but can't even pronounce "matcha" properly.