itch.io

Pointing out bugs is always cool, but instead of assuming game doesn't make sense and has plot flaws, you could relate it to the psychology of the human mind and try to find reasons on why it does, because contrary to your initial assumption, it very well does make sense. You just need to find a proper angle to see the picture. 
This game is clearly made in mind with testing human psyche and the bouundaries. That much is adamant from it's description. He doesn't block the gun, with some magicey power, he just speaks to us before we pull the trigger, because he well knows what we want to do. He is giving us chances to reconsider taking a life. He might have been hurt terribly, but as long as he didn't die, he could get justice, as mauled as he was, and it was the right thing to do.
It wouldn't make sense to assume he's the god of the game just because he abides by the rules. Besides, rules have been set in place, and following the most likely path author envisioned the game will give you a better clarity on why it's this way. Think of it like that: life's rules are also set in place and you can only ponder them. That's why scientists exist. Humans too can't change some rules: try to change how biology works on the molecular level. Most people can't tap into the potential of altering this world's rules alone or without accidentally disrupting the delicate balance and causing a tragedy instead.
To put it shortly, your assumption that Harvey could do more than he actually could, makes little sense in the whole context. He was the biggest victim of this system. He got into it hoping he will never meet someone that will hurt him this deeply, wanting to simply help people with the simple: you spend time with him, you get money. You get more extreme in this social experiment, you get more money. As you could see from a lack of any scarring or wounds before, *you* are potentially the first person to show him how horrible a person can become if they are desperate enough. This is an amazing take and a fresh replication study of the milgram experiment, but put into a cutesy little game to gather attention.
To put it shortly, the person behind it is a genius. The game is great as it is. Fixing bugs is cool, but it did what it intended to do: prove a point of how following rules and maximizing efficiency may, even if tempting, result in terrible human suffering.