Okay, so I played this after playing "Lucky Day" and now the true ending make so more sense.
This one game did make me feel scared, compared to the other one. I believe this shows Oliver's true side better. This also made more sense since I checked his character file and read his information. I will correct myself now, it's not a "bubble" for himself, it's a bubble made for the M/C. The fact that he fakes his facial expressions is more clear, you can notice at times how he struggles or forgets to put a "normal face" on.
This game made me like Oliver way more, I believe that this helped me a lot to understand his character. And, for being the creator's first novel, it's amazingly made. I enjoyed this a lot.