The Yuto minigames need some work. Right now, even with the cheats on, it is exceedingly difficult to successfully sleep with Lisa and improve Yuto and Lisa's relationship. The cheat increases the time such that technically it is now possible to win, but if a single mistake is made after getting 5/10, then your progress shoots all the way back down to 0/10. I imagine most people don't even realize that it is technically possible because if you are looking at the time and how long it takes the brain to travel for when progress is less than 5/10, it would be easy to come to the conclusion that it is literally impossible and just give up. I kind of get having something this unforgiving for the Natural path because it makes sense in terms of story, but the fact that it's still this bad even with cheats feels crazy.
I suggest making it so that during the minigame, make it such that Yuto won't lose progress when the brain is clicked outside of the heart zone. Instead, Kord's progress will simply increase. All this does is make the minigame potentially winnable with the fewest changes. To make it even better, either the entire game needs to be done so that the brain is randomly teleporting the way it does after 5/10 instead of slowly moving before that point, or the brain just needs to move fast enough to be able to be clicked 10 times within the time span.
I was also wondering, was it intentional that you can only gain one point of progress as the brain passes by the heart zone? If you click it a couple times, it pauses in space which makes me think you wanted it to be possible to get multiple points per pass, but as it currently stands, you only get one thus eating away at the extremely limited time that's available.
The fingering minigame also has a minor issue. Even with the cheats on, it is a genuine struggle to beat it. I recommend providing at least twice as much time as the Natural difficulty.