(disclosure: playing drunk)
I have Vampire Survivors. Bullets fly through walls, vampires(zombies) don't go through wall. I ran it on RTX5700Ti and
I assume I could hit them outside of visible area cause it got so lagging in the end so much that I could hear "bullet, bullet, bullet, bullet, bullet, bullet" when shooting. 
When I got out, I was killed by air (or the stench of zombies) 🧟♂️

I liked it though and the idea is worth exploring. Good job making it into browser playable.

