I got a "Radeon Vega 56" and run 4 screens with it.
Viewing post in Cosmc Horror jam comments
https://wooolfy.itch.io/cosmc-horror-web-version
(this is the same build as web version. i tried it out a couple of minutes but it is not testet thouroughly at all. also i never made a web build before... so try at own risk). but at least it should be playable for you now. just remember: save/load might crash the game on web so don't try it