Snowstar
Too many skip.. While i understand that many reader prefer game world setting more than the real world setting, there is just too many thing that skipped over. For example this novel use mafia betrayal as one of the plot right? So i believe that who betray the organisation is important to the plot, but why is "investigation phase", "foreshadow for who is the killer is", "how mc tell his dad about this" and etc is skipped? The "investigation phase" chapter can be used as the foundation as the world setting like how the mafia work or how the mc ask around who close to him so you can introduce some important character. While "foreshadow for who the killer is" not really important, you can use this chance to throw some red herring too instead of skipping it so the reader can have some "OH?" feeling once in a while. "How mc tell about this" is even more important as you can use this for introduce his dad character and make MC more important in the eyes of his dad so more plot can be introduced later on. And mate, telling us that mc waiting 12 whole minute and proceeded to not explaining anything about the device is ridiculous.. heck if you don't want to explain it just yet then start the counter from 15 sec or even 1 min to tell the reader that he is anticipating the start of the game so he is not interested in the device that probably just have an increase about 15% from the A-class device...
this system is not balanced i will break it down for by race angel- 50% increase in power + divinity Demon-20% increase in power human- average Elf- 20% decrease in power everywhere but forests this means: angel > demon > human > elf you are setting a system up to fail. now don't get me wrong the concept of the story is interesting but its not fun when you are forced to pick either angel or demon otherwise you will be steamrolled in game unless you get super lucky