After some extensive tinkering, I managed to get a config which made the gae playable at about 19-20 fps on Intel UHD 620 while keeping a reasonable good look.

Anyone is welcome to suggest improvements.

The config (user.settings) is available here:

https://1drv.ms/u/s!AlQOXtNhmV-rgd45BLOwIbJ58dOnRQ?e=cfWhDZ

The game is still buggy for me but it's manageable so far.