with 2 vision upgrades I was able to cheese the final boss by just getting it aggro'd then walking outside the room and sitting there behind a wall. it spawning the mobs deaggro'd it, but then I just walk forward, walk back behind the wall. I got up and took a piss and got an ice cream sandwich during the final boss lol.
seems like the way the game works is that my guys require a direct line of sight to initiate an attack, but not one to maintain an attack. might wanna fix that, also pulled this strat off in the catacombs.
I beat the game in like 30 minutes when it says 2-4 hours 😔