While there is nothing wrong with having a different opinion than everyone else, there are problems when you get stuff wrong.
1. Visual Novels are actually classified as games. Even if they weren't it wouldn't be too far-fetched to say that they are when we have these adventure games, where you literally just have to move around without any sort of challenge and you just simply get story. As this point was risen from the issue of decisions not having an impact, let's address that too. Decisions right now don't have too much impact. There are scenes that are only triggered by making certain decisions. Other than that, certain dialogues are slighty different. Overall the game follows the standard eroges line that have multiple endings (Common Route -> Character Route -> Ending). As the game looks so far, the big complication is about to happen. That is where the "Common Route" usually ends. As for what this turns into in the end, nobody knows (except for Ink).
2. No real issue on this point, except for the very last bit: I think it's very much out of line to suggest adding others to the team or requesting outside help. Suggesting changes to something is fine, suggesting changes to a team is not.
3. At it's core, this is still about porn. And that is something to keep in mind when thinking about character decisions and such. Many of the characteristics are not clear from the get-go, but the characters are set up relatively well, considering all.
Really the only thing needed to make it less "weird" is to give MC a slight aversion to incest. I believe there is noone who would do stuff with family members without first convincing themselves that it's fine and then repeat it at every corner.
4. I believe this point goes back to what I finished the above point with.
5. While I have no knowledge of the various beliefs of Tibetan Monks, I still think that if there is no other option, it's not too far-fetched for a less devoted monk to eat a carcass. I mean, it's already dead. As long as there is a possibility, then there can be a story about it. Even if the probability is microscopic.