I struggled with it as well. My main problem seemed to be that no matter how many side quests I did, I was still underleveled for most enemy encounters. I did read that upgrading gear is worth more than levels, but it was such a grind to go and find all the materials that I eventually got bored. Shame though, because it’s really well made.
Someone has come up with an installer for the Steamdeck as well:
https://overkill.wtf/fallout-london-steam-deck-1-click-installer/
I’d say they must mean PC - It runs fine for me with Yuzu on a good gaming PC using OpenGLSL. It’s locked to 30fps though unless there’s some setting I don’t know about.
It’s so far unplayable for me on the SteamDeck because of the requirement for OpenGLSL - it works, but it runs at about 10fps. Using Vulkan seems to be closer to 30fps on SteamDeck, so I imagine when this is fixed it will be playable on the SD, but that is not the case right now. I’m using the latest pinEApple build.
It was Sprong that took me ages, and I’d already largely beaten the game at that point.