Thank you for give it a try even with quarantine warning. I send email to itch support but they didn't answered yet.
From what I see on screenshot you played on lowest graphic settings. I tried optimize it good enough for everyone to play.
About the combat. Well... you are not supposed to ignore all the enemies but It is a viable strategy that I used a lot while testing. Don't know if you notice but you can perform sneak kill if you approach Otomo from behind and they didn't notice you.